| monoclinous | (adjective) having pistils and stamens in the same flower | - |
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| monocotyledonous | (adjective) (of a flowering plant) having a single cotyledon in the seed as in grasses and lilies | - |
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| monoecious | (adjective) having male and female reproductive organs in the same plant or animal | Synonyms: monecious, monoicous |
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| monoestrous | (adjective) having one estrous cycle per year | Synonyms: monestrous |
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| monogamous | (adjective) (used of relationships and of individuals) having one mate | - |
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| monogynous | (adjective) having one head or chief wife at a time (along with concubines) | Synonyms: monogynic |
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| monoicous | (adjective) having male and female reproductive organs in the same plant or animal | Synonyms: monecious, monoecious |
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| monosemous | (adjective) having only one meaning | - |
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| monotonous | (adjective) tediously repetitious or lacking in variety | Synonyms: humdrum |
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| (adjective) sounded or spoken in a tone unvarying in pitch | Synonyms: flat, monotone, monotonic |
| monstrous | (adjective) shockingly brutal or cruel | Synonyms: atrocious, flagitious, grievous |
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| (adjective) abnormally large | - |
| (adjective) distorted and unnatural in shape or size; abnormal and hideous | Synonyms: grotesque |
| moraceous | (adjective) of or pertaining to or characteristic of plants of the family Moraceae | - |
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| mordacious | (adjective) biting or given to biting | - |
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| (adjective) capable of wounding | Synonyms: barbed, biting, nipping, pungent |
| motorbus | (noun) a vehicle carrying many passengers; used for public transport | Synonyms: autobus, bus, charabanc, coach, double-decker, jitney, motorcoach, omnibus, passenger vehicle |
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| mountainous | (adjective) like a mountain in size and impressiveness | - |
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| (adjective) having hills and crags | Synonyms: cragged, craggy, hilly |
| (adjective) containing many mountains | - |
| muciferous | (adjective) containing or secreting mucus | - |
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| mucilaginous | (adjective) having the sticky properties of an adhesive | Synonyms: gluey, glutinous, gummy, pasty, sticky, viscid, viscous |
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| mucinous | (adjective) relating to or containing mucin | - |
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| mucocutaneous | (adjective) of or relating to the mucous membranes and skin | - |
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| mucous | (adjective) of or secreting or covered with or resembling mucus | Synonyms: mucose |
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| mucus | (noun) protective secretion of the mucous membranes; in the gut it lubricates the passage of food and protects the epithelial cells; in the nose and throat and lungs it can make it difficult for bacteria to penetrate the body through the epithelium | Synonyms: mucous secretion |
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| multifarious | (adjective) having many aspects or qualities | Synonyms: many-sided, miscellaneous, multifaceted |
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| multiparous | (adjective) producing more than one offspring at a time | - |
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| multitudinous | (adjective) too numerous to be counted | Synonyms: countless, infinite, innumerable, innumerous, myriad, numberless, uncounted, unnumberable, unnumbered, unnumerable |
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| mumpsimus | (noun) a traditional notion that is obstinately held although it is unreasonable | - |
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| murderous | (adjective) characteristic of or capable of or having a tendency toward killing another human being | Synonyms: homicidal |
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| murmurous | (adjective) characterized by soft sounds | Synonyms: rustling, soughing, susurrous |
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| musculus | (noun) one of the contractile organs of the body | Synonyms: muscle |
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| mutinous | (adjective) consisting of or characterized by or inciting to mutiny | - |
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| (adjective) disposed to or in a state of mutiny | - |
| myoclonus | (noun) a clonic spasm of a muscle or muscle group | - |
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| myrmecophagous | (adjective) feeding on ants | - |
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| myrmecophilous | (adjective) living symbiotically with ants | - |
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| mysterious | (adjective) having an import not apparent to the senses nor obvious to the intelligence; beyond ordinary understanding | Synonyms: mystic, mystical, occult, orphic, secret |
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| (adjective) of an obscure nature | Synonyms: cryptic, cryptical, deep, inscrutable, mystifying |
| myxovirus | (noun) any of a group of RNA viruses including those that cause influenza and mumps | - |
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| nacreous | (adjective) consisting of or resembling mother-of-pearl | - |
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| (adjective) having a play of lustrous rainbow colors | Synonyms: iridescent, opalescent, opaline, pearlescent |
| nanus | (noun) a person who is markedly small | Synonyms: dwarf, midget |
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| narcissus | (noun) bulbous plant having erect linear leaves and showy yellow or white flowers either solitary or in clusters | - |
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| nauseous | (adjective) feeling nausea; feeling about to vomit | Synonyms: nauseated, queasy, sick, sickish |
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| (adjective) causing or able to cause nausea | Synonyms: loathsome, nauseating, noisome, offensive, queasy, sickening, vile |
| nautilus | (noun) cephalopod of the Indian and Pacific oceans having a spiral shell with pale pearly partitions | Synonyms: chambered nautilus, pearly nautilus |
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| (noun) cephalopod mollusk of warm seas whose females have delicate papery spiral shells | Synonyms: Argonaut, Argonauta argo, paper nautilus |
| (noun) a submarine that is propelled by nuclear power | Synonyms: nuclear-powered submarine, nuclear submarine |
| nebulous | (adjective) of or relating to or resembling a nebula | Synonyms: nebular |
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| (adjective) lacking definition or definite content | Synonyms: unfixed |
| (adjective) lacking definite form or limits | Synonyms: cloudy, nebulose |
| necessitous | (adjective) poor enough to need help from others | Synonyms: destitute, impoverished, indigent, needy, poverty-stricken |
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| nectariferous | (adjective) possessing nectaries | - |
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| nectarous | (adjective) extremely pleasing to the taste; sweet and fragrant | Synonyms: ambrosial, ambrosian |
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| nefarious | (adjective) extremely wicked | Synonyms: villainous |
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| negus | (noun) wine and hot water with sugar and lemon juice and nutmeg | - |
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| neotenous | (adjective) of or relating to or characterized by neoteny | Synonyms: neotenic |
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| nervous | (adjective) of or relating to the nervous system | Synonyms: neural |
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| (adjective) unpredictably excitable (especially of horses) | Synonyms: flighty, skittish, spooky |
| (adjective) excited in anticipation | Synonyms: aflutter |
| (adjective) easily agitated | - |
| (adjective) causing or fraught with or showing anxiety | Synonyms: anxious, queasy, uneasy, unquiet |
| nervus | (noun) any bundle of nerve fibers running to various organs and tissues of the body | Synonyms: nerve |
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| neuromatous | (adjective) of or relating to or caused by neuromas | - |
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| nevus | (noun) a blemish on the skin that is formed before birth | Synonyms: birthmark |
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| nexus | (noun) a connected series or group | - |
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| (noun) the means of connection between things linked in series | Synonyms: link |
| nidicolous | (adjective) (of birds) remaining in the nest for a time after hatching | - |
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| nidifugous | (adjective) (of birds) leaving the nest shortly after hatching | - |
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| nidus | (noun) a nest in which spiders or insects deposit their eggs | - |
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| (noun) a central point or locus of an infection in an organism | Synonyms: focal point, focus |
| nimbus | (noun) an indication of radiant light drawn around the head of a saint | Synonyms: aura, aureole, gloriole, glory, halo |
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| (noun) a dark grey cloud bearing rain | Synonyms: nimbus cloud, rain cloud |
| nisus | (noun) an effortful attempt to attain a goal | Synonyms: pains, strain, striving |
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| nitrogenous | (adjective) of or relating to or containing nitrogen | Synonyms: nitrogen-bearing |
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| nitrous | (adjective) of or containing nitrogen | Synonyms: azotic, nitric |
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| nonautonomous | (adjective) (of peoples and political bodies) controlled by outside forces | Synonyms: nonsovereign |
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| nonconscious | (adjective) relating to the lack of consciousness of inanimate things | - |
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| (adjective) concerning mental functioning that is not represented in consciousness | - |
| noncontagious | (adjective) (of disease) not capable of being passed on | Synonyms: noncommunicable, nontransmissible |
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| noncontentious | (adjective) of persons; not given to controversy | - |
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| noncontinuous | (adjective) not continuing without interruption in time or space | Synonyms: discontinuous |
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| nonglutinous | (adjective) not resembling glue in texture | Synonyms: nonviscid |
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| nongregarious | (adjective) of plants and animals; not growing or living in groups or colonies | Synonyms: nonsocial, solitary |
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| noninfectious | (adjective) not infectious | - |
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| nonplus | (verb) be a mystery or bewildering to | Synonyms: amaze, baffle, beat, bewilder, dumbfound, flummox, get, gravel, mystify, perplex, pose, puzzle, stick, stupefy, vex |
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| nonpoisonous | (adjective) safe to eat | Synonyms: non-poisonous, nontoxic |
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| (adjective) not producing poison | Synonyms: non-poisonous |
| nonporous | (adjective) not porous; especially not having vessels that appear as pores | - |
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| nonresinous | (adjective) not having resin | Synonyms: non-resinous, non-resiny, nonresiny |
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| nonsynchronous | (adjective) not occurring together | Synonyms: unsynchronised, unsynchronized, unsynchronous |
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| nonvenomous | (adjective) not producing venom | - |
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| notorious | (adjective) known widely and usually unfavorably | Synonyms: ill-famed, infamous |
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| nous | (noun) that which is responsible for one's thoughts, feelings, and conscious brain functions; the seat of the faculty of reason | Synonyms: brain, head, mind, psyche |
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| (noun) common sense | - |
| noxious | (adjective) injurious to physical or mental health | - |
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| nucellus | (noun) central part of a plant ovule; contains the embryo sac | - |
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| nucleolus | (noun) a small round body of protein in a cell nucleus; such organelles contain RNA and are involved in protein synthesis | Synonyms: nucleole |
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| nucleus | (noun) a part of the cell containing DNA and RNA and responsible for growth and reproduction | Synonyms: cell nucleus, karyon |
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| (noun) any histologically identifiable mass of neural cell bodies in the brain or spinal cord | - |
| (noun) the central structure of the lens that is surrounded by the cortex | Synonyms: lens nucleus |
| (noun) a small group of indispensable persons or things | Synonyms: core, core group |
| (noun) the positively charged dense center of an atom | - |
| (noun) (astronomy) the center of the head of a comet; consists of small solid particles of ice and frozen gas that vaporizes on approaching the sun to form the coma and tail | - |
| numerous | (adjective) amounting to a large indefinite number | Synonyms: legion |
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| numinous | (adjective) of or relating to or characteristic of a numen | - |
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| (adjective) evincing the presence of a deity | - |
| nutritious | (adjective) of or providing nourishment | Synonyms: alimental, alimentary, nourishing, nutrient, nutritive |
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| nystagmus | (noun) involuntary movements of the eyeballs; its presence or absence is used to diagnose a variety of neurological and visual disorders | - |
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| oblivious | (adjective) failing to keep in mind | Synonyms: forgetful |
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| (adjective) (followed by `to' or `of') lacking conscious awareness of | Synonyms: unmindful |
| obnoxious | (adjective) causing disapproval or protest | Synonyms: objectionable |
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| obolus | (noun) a Greek unit of weight equal to one tenth of a gram | - |
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| obsequious | (adjective) attempting to win favor from influential people by flattery | Synonyms: bootlicking, fawning, sycophantic, toadyish |
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| (adjective) attentive in an ingratiating or servile manner | - |
| obstreperous | (adjective) boisterously and noisily aggressive | - |
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| (adjective) noisily and stubbornly defiant | - |
| obvious | (adjective) easily perceived and understood | - |
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| ocellus | (noun) an eyelike marking (as on the wings of some butterflies); usually a spot of color inside a ring of another color | Synonyms: eyespot |
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| (noun) an eye having a single lens | Synonyms: simple eye, stemma |
| octopus | (noun) bottom-living cephalopod having a soft oval body with eight long tentacles | Synonyms: devilfish |
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| (noun) tentacles of octopus prepared as food | - |
| oculus | (noun) the organ of sight | Synonyms: eye, optic |
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| odious | (adjective) unequivocally detestable | Synonyms: abominable, detestable, execrable |
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| odoriferous | (adjective) having a natural fragrance | Synonyms: odorous, perfumed, scented, sweet-scented, sweet-smelling, sweet |
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| (adjective) emitting an odor | Synonyms: odorous |
| odorous | (adjective) having odor or a characteristic odor | - |
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| (adjective) having a natural fragrance | Synonyms: odoriferous, perfumed, scented, sweet-scented, sweet-smelling, sweet |
| (adjective) emitting an odor | Synonyms: odoriferous |
| oesophagus | (noun) the passage between the pharynx and the stomach | Synonyms: esophagus, gorge, gullet |
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| oestrus | (noun) applies to nonhuman mammals: a state or period of heightened sexual arousal and activity | Synonyms: estrus, heat, rut |
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| officious | (adjective) intrusive in a meddling or offensive manner | Synonyms: busy, busybodied, interfering, meddlesome, meddling |
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| oleaceous | (adjective) of or pertaining to or characteristic of trees or shrubs of the olive family | - |
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| oleaginous | (adjective) containing an unusual amount of grease or oil | Synonyms: greasy, oily, sebaceous |
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| (adjective) unpleasantly and excessively suave or ingratiating in manner or speech | Synonyms: buttery, fulsome, oily, smarmy, soapy, unctuous |
| ominous | (adjective) threatening or foreshadowing evil or tragic developments | Synonyms: baleful, forbidding, menacing, minacious, minatory, sinister, threatening |
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| (adjective) presaging ill fortune | Synonyms: ill, inauspicious |
| omnibus | (adjective) providing for many things at once | - |
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| (noun) a vehicle carrying many passengers; used for public transport | Synonyms: autobus, bus, charabanc, coach, double-decker, jitney, motorbus, motorcoach, passenger vehicle |
| (noun) an anthology of articles on a related subject or an anthology of the works of a single author | - |