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mordant adj。 Biting。
moribund adj。 On the point of dying。
morose adj。 Gloomy。
morphology n。 the science of organic forms。
motley adj。 posed of heterogeneous or inharmonious elements。
motto n。 An expressive word or pithy sentence enunciating some guiding rule of life； or faith。
mountaineer n。 One who travels among or climbs mountains for pleasure or exercise。
mountainous adj。 Full of or abounding in mountains。
mouthful n。 As much as can be or is usually put into the or exercise。
muddle v。 To confuse or becloud； especially with or as with drink。
muffle v。 To deaden the sound of； as by wraps。
mulatto n。 The offspring of a white person and a black person。
muleteer n。 A mule…driver。
multiform adj。 Having many shapes； or appearances。
multiplicity n。 the condition of being manifold or very various。
mundane adj。 Worldly； as opposed to spiritual or celestial。
municipal adj。 Of or pertaining to a town or city； or to its corporate or local government。
municipality n。 A district enjoying municipal government。
munificence n。 A giving characterized by generous motives and extraordinary liberality。
munificent adj。 Extraordinarily generous。
muster n。 An assemblage or review of troops for parade or inspection； or for numbering off。
mutation n。 The act or process of change。
mutilate v。 To disfigure。
mutiny n。 Rebellion against lawful or constituted authority。
myriad n。 A vast indefinite number。
mystic n。 One who professes direct divine illumination； or relies upon meditation to acquire truth。
mystification n。 The act of artfully perplexing。
myth n。 A fictitious narrative presented as historical； but without any basis of fact。
mythology n。 The whole body of legends cherished by a race concerning gods and heroes。
nameless adj。 Having no fame or reputation。
naphtha n。 A light； colorless； volatile； inflammable oil used as a solvent； as in manufacture of paints。
Narcissus n。 The son of the Athenian river…god Cephisus； fabled to have fallen in love with his reflection。
narrate v。 To tell a story。
narration n。 The act of recounting the particulars of an event in the order of time or occurrence。
narrative n。 An orderly continuous account of the successive particulars of an event。
narrator n。 One who narrates anything。
narrow…minded adj。 Characterized by illiberal views or sentiments。
nasal adj。 Pertaining to the nose。
natal adj。 Pertaining to one's birth。
nationality n。 A connection with a particular nation。
naturally adv。 According to the usual order of things。
nausea n。 An affection of the stomach producing dizziness and usually an impulse to vomit
nauseate v。 To cause to loathe。
nauseous adj。 Loathsome。
nautical adj。 Pertaining to ships； seamen； or navigation。
naval adj。 Pertaining to ships。
navel n。 The depression on the abdomen where the umbilical cord of the fetus was attached。
navigable adj。 Capable of mercial navigation。
navigate v。 To traverse by ship。
nebula n。 A gaseous body of unorganized stellar substance。
necessary adj。 Indispensably requisite or absolutely needed to acplish a desired result。
necessitate v。 To render indispensable。
necessity n。 That which is indispensably requisite to an end desired。
necrology n。 A list of persons who have died in a certain place or time。
necromancer n。 One who practices the art of foretelling the future by means of munication with the dead。
necropolis n。 A city of the dead。
necrosis n。 the death of part of the body。
nectar n。 Any especially sweet and delicious drink。
nectarine n。 A variety of the peach。
needlework n。 Embroidery。
needy adj。 Being in need； want； or poverty。
nefarious adj。 Wicked in the extreme。
negate v。 To deny。
negation n。 The act of denying or of asserting the falsity of a proposition。
neglectful adj。 Exhibiting or indicating omission。
negligee n。 A loose gown worn by women。
negligence n。 Omission of that which ought to be done。
negligent adj。 Apt to omit what ought to be done。
negligible adj。 Transferable by assignment； endorsement； or delivery。
negotiable v。 To bargain with others for an agreement； as for a treaty or transfer of property。
Nemesis n。 A goddess； divinity of chastisement and vengeance。
neocracy n。 Government administered by new or untried persons。
neo…Darwinsim n。 Darwinism as modified and extended by more recent students。
neo…Latin n。 Modernized Latin。
neopaganism n。 A new or revived paganism。
Neolithic adj。 Pertaining to the later stone age。
neology n。 The coining or using of new words or new meanings of words。
neophyte adj。 Having the character of a beginner。
nestle v。 To adjust cozily in snug quarters。
nestling adj。 Recently hatched。
nettle v。 To excite sensations of uneasiness or displeasure in。
network n。 Anything that presents a system of cross… lines。
neural adj。 Pertaining to the nerves or nervous system。
neurology n。 The science of the nervous system。
neuter adj。 Neither masculine nor feminine。
neutral adj。 Belonging to or under control of neither of two contestants。
nevertheless conj。 Notwithstanding。
Newtonian adj。 Of or pertaining to Sir Isaac Newton； the English philosopher。
niggardly adj。 Stingy。 （no longer acceptable to use）
nihilist n。 An advocate of the doctrine that nothing either exists or can be known。
nil n。 Nothing
nimble adj。 Light and quick in motion or action。
nit n。 The egg of a louse or some other insect。
nocturnal adj。 Of or pertaining to the night。
noiseless adj。 Silent。
noisome adj。 Very offensive； particularly to the sense of smell。
noisy adj。 Clamorous。
nomad adj。 Having no fixed abode。
nomic adj。 Usual or customary。
nominal adj。 Trivial。
nominate v。 To designate as a candidate for any office。
nomination n。 The act or ceremony of naming a man or woman for office。
nominee n。 One who receives a nomination。
non…existent n。 That which does not exist。
non…resident adj。 Not residing within a given jurisdiction。
nonchalance n。 A state of mind indicating lack of interest。
non…batant n。 One attached to the army or navy； but having duties other than that of fighting。
nondescript adj。 Indescribable。
nonentity n。 A person or thing of little or no account。
nonpareil n。 One who or that which is of unequaled excellence。
norm n。 A model。
normalcy n。 The state of being normal。
Norman adj。 Of or peculiar to Normandy； in northern France。
nostrum n。 Any scheme or recipe of a charlatan character。
noticeable adj。 Perceptible。
notorious adj。 Unfavorably known to the general public。
novellette n。 A short novel。
novice n。 A beginner in any business or occupation。
nowadays adv。 In the present time or age。
nowhere adv。 In no place or state。
noxious adj。 Hurtful。
nuance n。 A slight degree of difference in anything perceptible to the sense of the mind。
nucleus n。 A central point or part about which matter is aggregated。
nude adj。 Naked。
nugatory adj。 Having no power or force。
nuisance n。 That which annoys； vexes； or irritates。
numeration n。 The act or art of reading or naming numbers。
numerical adj。 Of or pertaining to number。
nunnery n。 A convent for nuns。
nuptial adj。 Of or pertaining to marriage； especially to the marriage ceremony。
nurture n。 The process of fostering or promoting growth。
nutriment n。 That which nourishes。
nutritive adj。 Having nutritious properties。
oaken adj。 Made of or from oak。
oakum n。 Hemp…fiber obtained by untwisting and picking out loosely the yarns of old hemp rope。
obdurate adj。 Impassive to feelings of humanity or pity。
obelisk n。 A square shaft with pyramidal top； usually monumental or memorative。
obese adj。 Exceedingly fat。
obesity n。 Excessive fatness。
obituary adj。 A published notice of a death。
objective adj。 Grasping and representing facts as they are。
objector n。 One who objects； as to a proposition； measure； or ruling。
obligate v。 To hold to the fulfillment of duty。
obligatory adj。 Binding in law or conscience。
oblique adj。 Slanting； said of lines。
obliterate v。 To cause to disappear。
oblivion n。 The state of having passed out of the memory or of being utterly forgotten。
oblong adj。 Longer than broad： applied most monly to rectangular objects considerably elongated
obnoxious adj。 Detestable。
obsequies n。 Funeral rites。
obsequious adj。 Showing a servile readiness to fall in with the wishes or will of another。
observance n。 A traditional form or customary act。
observant adj。 Quick to notice。
observatory n。 A building designed for systematic astronomical observations。
obsolescence n。 The condition or process of gradually falling into disuse。
obsolescent adj。 Passing out of use； as a word。
obsolete adj。 No longer practiced or accepted。
obstetrician n。 A practitioner of midwifery。
obstetrics n。 The branch of medical science concerned with the treatment and care of women during pregnancy。
obstinacy n。 Stubborn adherence to opinion； arising from conceit or the desire to have one's own way。
obstreperous adj。 Boisterous。
obstruct v。 To fill with impediments so as to prevent passage； either wholly or in part。
obstruction n。 Hindrance。
obtrude v。 To be pushed or to push oneself into undue prominence。
obtrusive adj。 Tending to be pushed or to push oneself into undue prominence。
obvert v。 To turn the front or principal side of （a thing） toward any person or object。
obviate v。 To clear away or provide for； as an objection or difficulty。
occasion n。 An important event or celebration。
Occident n。 The countries lying west of Asia and the Turkish dominions。
occlude v。 To absorb； as a gas by a metal。
occult adj。 Existing but not immediately perceptible。
occupant n。 A tenant in possession of property； as distinguished from the actual owner。
occurrence n。 A happening。
octagon n。 A figure with eight sides and eight angles。
octave n。 A note at this interval above or below any other； considered in relation to that other。
octavo n。 A book； or collection of paper in which the sheets are so folded as to make eight leaves。
octogenarian adj。 A person of between eighty and ninety years。
ocular adj。 Of or pertaining to the eye。
oculist n。 One versed or skilled in treating diseases of the eye。
oddity n。 An eccentricity。
ode n。 The form of lyric poetry anciently intended to be sung。
odious adj。 Hateful。
odium n。 A feeling of extreme repugnance； or of dislike and disgust。
odoriferous adj。 Having or diffusing an odor or scent； especially an agreeable one。
odorous adj。 Having an odor； especially a fragrant one。
off adj。 Farther or more distant。
offhand adv。 Without preparation。
officiate v。 To act as an officer or leader。
officious adj。 Intermeddling with what is not one's concern。
offshoot n。 Something that branches off from the parent stock。
ogre n。 A demon or monster that was supposed to devour human beings。
ointment n。 A fatty preparation with a butter…like consistency in which a medicinal substance exists。
olfactory adj。 of or pertaining to the sense of smell。
olive…branch n。 A branch of the olive…tree； as an emblem of peace。
ominous adj。 Portentous。
omission n。 Exclusion。
omnipotence n。 Unlimited and universal power。
Omnipotent adj。 Possessed of unlimited and universal power。
omniscience n。 Unlimited or infinite knowledge。
omniscient adj。 Characterized by unlimited or infinite knowledge。
omnivorous adj。 Eating or living upon food of all kinds indiscriminately。
onerous adj。 Burdensome or oppressive。
onrush n。 Onset。
onset n。 An assault； especially of troops； upon an enemy or fortification。
onslaught n。 A violent onset。
onus n。 A burden or responsibility。
opalescence n。 The property of bined refraction and reflection of light； resulting in smoky tints。
opaque adj。 Impervious to light。
operate v。 To put in action and supervise the working of。
operative adj。 Active。
operator n。 One who works with or controls some machine or scientific apparatus。
operetta n。 A humorous play in dialogue and music； of more than one act。
opinion n。 A conclusion or judgment held with confidence； but falling short of positive knowledge。
opponent n。 One who supports the opposite side in a debate； discussion； struggle； or sport。
opportune adj。 Especially fit as occurring； said； or done at the right moment。
opportunist n。 One who takes advantage of circumstances to gain his ends。
opportunity n。 Favorable or advantageous chance or opening。
opposite adj。 Radically different or contrary in action or m