| mendelevium | (noun) a radioactive transuranic element synthesized by bombarding einsteinium with alpha particles (Md is the current symbol for mendelevium but Mv was formerly the symbol) | Synonyms: atomic number 101, Md, Mv |
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| menstruum | (noun) the monthly discharge of blood from the uterus of nonpregnant women from puberty to menopause | Synonyms: catamenia, flow, menses, menstruation, period |
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| (noun) (archaic) a solvent | - |
| mentum | (noun) a projection below the mouth of certain mollusks that resembles a chin | - |
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| (noun) the protruding part of the lower jaw | Synonyms: chin |
| (noun) a projection like a chin formed by the sepals and base of the column in some orchids | - |
| mesothelium | (noun) epithelium originating in the embryonic mesoderm; lines the primordial body cavity | - |
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| mezereum | (noun) the dried bark of the shrub mezereon | - |
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| microsporangium | (noun) a plant structure that produces microspores | - |
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| midsummer | (noun) June 21, when the sun is at its northernmost point | Synonyms: June 21, summer solstice |
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| milium | (noun) a small whitish lump in the skin due to a clogged sebaceous gland | Synonyms: whitehead |
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| millennium | (noun) a span of 1000 years | Synonyms: millenary |
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| (noun) (New Testament) in the Book of Revelation it is foretold that those faithful to Jesus will reign with Jesus over the earth for a thousand years; the meaning of these words have been much debated; some denominations (e.g. Jehovah's Witnesses) expect it to be a thousand years of justice and peace and happiness | - |
| (noun) the 1000th anniversary (or the celebration of it) | Synonyms: millenary |
| millenniumism | (noun) belief in the Christian doctrine of the millennium mentioned in the Book of Revelations | Synonyms: chiliasm, millenarianism, millenarism |
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| minimum | (adjective) the least possible | Synonyms: minimal |
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| (noun) the point on a curve where the tangent changes from negative on the left to positive on the right | - |
| (noun) the smallest possible quantity | Synonyms: lower limit |
| minium | (noun) a reddish oxide of lead (Pb3O4) used as a pigment in paints and in glass and ceramics | Synonyms: red lead |
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| modicum | (noun) a small or moderate or token amount | - |
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| molluscum | (noun) any skin disease characterized by soft pulpy nodules | - |
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| molybdenum | (noun) a polyvalent metallic element that resembles chromium and tungsten in its properties; used to strengthen and harden steel | Synonyms: atomic number 42, Mo |
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| momentum | (noun) an impelling force or strength | Synonyms: impulse |
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| (noun) the product of a body's mass and its velocity | - |
| monument | (noun) a structure erected to commemorate persons or events | Synonyms: memorial |
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| (noun) a burial vault (usually for some famous person) | Synonyms: repository |
| (noun) an important site that is marked and preserved as public property | - |
| monumental | (adjective) relating or belonging to or serving as a monument | - |
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| (adjective) imposing in size or bulk or solidity | Synonyms: massive, monolithic |
| (adjective) of outstanding significance | - |
| monumentalise | (verb) record or memorialize lastingly with a monument | Synonyms: monumentalize |
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| monumentalize | (verb) record or memorialize lastingly with a monument | Synonyms: monumentalise |
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| moratorium | (noun) suspension of an ongoing activity | - |
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| (noun) a legally authorized postponement before some obligation must be discharged | - |
| mugwump | (noun) a neutral or uncommitted person (especially in politics) | Synonyms: fencesitter, independent |
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| mum | (adjective) failing to speak or communicate etc when expected to | Synonyms: silent |
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| (noun) secrecy | - |
| (noun) informal terms for a mother | Synonyms: ma, mama, mamma, mammy, mom, momma, mommy, mumma, mummy |
| (noun) of China | Synonyms: Chrysanthemum morifolium, Dendranthema grandifloruom, florist's chrysanthemum, florists' chrysanthemum |
| mumble | (noun) a soft indistinct utterance | - |
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| (verb) talk indistinctly; usually in a low voice | Synonyms: maunder, mussitate, mutter |
| (verb) grind with the gums; chew without teeth and with great difficulty | Synonyms: gum |
| mumbler | (noun) a person who speaks softly and indistinctly | Synonyms: murmurer, mutterer |
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| mumbling | (noun) ineffectual chewing (as if without teeth) | Synonyms: gumming |
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| (noun) indistinct enunciation | - |
| mumma | (noun) informal terms for a mother | Synonyms: ma, mama, mamma, mammy, mom, momma, mommy, mum, mummy |
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| mummer | (noun) an actor who communicates entirely by gesture and facial expression | Synonyms: mime, mimer, pantomimer, pantomimist |
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| mummery | (noun) meaningless ceremonies and flattery | Synonyms: flummery |
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| mummichog | (noun) silver-and-black killifish of saltwater marshes along the Atlantic coast of the United States | Synonyms: Fundulus heteroclitus |
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| mummification | (noun) embalmment and drying a dead body and wrapping it as a mummy | - |
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| (noun) a condition resembling that of a mummy | - |
| (noun) (pathology) gangrene that develops in the presence of arterial obstruction and is characterized by dryness of the dead tissue and a dark brown color | Synonyms: cold gangrene, dry gangrene, mumification necrosis |
| mummify | (verb) dry up and shrivel due to complete loss of moisture | Synonyms: dry up |
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| (verb) remove the organs and dry out (a dead body) in order to preserve it | - |
| (verb) preserve while making lifeless | - |
| mummy | (noun) a body embalmed and dried and wrapped for burial (as in ancient Egypt) | - |
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| (noun) informal terms for a mother | Synonyms: ma, mama, mamma, mammy, mom, momma, mommy, mum, mumma |
| mumps | (noun) an acute contagious viral disease characterized by fever and by swelling of the parotid glands | Synonyms: epidemic parotitis |
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| mumpsimus | (noun) a traditional notion that is obstinately held although it is unreasonable | - |
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| museum | (noun) a depository for collecting and displaying objects having scientific or historical or artistic value | - |
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| muumuu | (noun) a woman's loose unbelted dress | Synonyms: Mother Hubbard |
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| mycelium | (noun) the vegetative part of a fungus consisting of a mass of branching threadlike hyphae | - |
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| mycobacterium | (noun) rod-shaped bacteria some saprophytic or causing diseases | Synonyms: mycobacteria |
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| myocardium | (noun) the middle muscular layer of the heart wall | - |
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| myometrium | (noun) the smooth muscle forming the wall of the uterus | - |
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| myxobacterium | (noun) bacteria that form colonies in self-produced slime; inhabit moist soils or decaying plant matter or animal waste | Synonyms: gliding bacteria, myxobacter, myxobacteria, slime bacteria |
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| nabumetone | (noun) a nonsteroidal anti-inflammatory drug (trade name Relafen) | Synonyms: Relafen |
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| nasturtium | (noun) flowers and seeds and leaves all used as flavorings | - |
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| (noun) any tropical American plant of the genus Tropaeolum having pungent juice and long-spurred yellow to red flowers | - |
| natatorium | (noun) pool that provides a facility for swimming | Synonyms: swimming bath, swimming pool |
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| naumachia | (noun) a naval spectacle; a mock sea battle put on by the ancient Romans | Synonyms: naumachy |
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| naumachy | (noun) a naval spectacle; a mock sea battle put on by the ancient Romans | Synonyms: naumachia |
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| neodymium | (noun) a yellow trivalent metallic element of the rare earth group; occurs in monazite and bastnasite in association with cerium and lanthanum and praseodymium | Synonyms: atomic number 60, Nd |
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| neopallium | (noun) the cortical part of the neencephalon | Synonyms: neocortex |
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| neptunium | (noun) a radioactive transuranic metallic element; found in trace amounts in uranium ores; a by-product of the production of plutonium | Synonyms: atomic number 93, Np |
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| neuroepithelium | (noun) epithelium associated with special sense organs and containing sensory nerve endings | - |
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| ngultrum | (noun) the basic unit of money in Bhutan | - |
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| niobium | (noun) a soft grey ductile metallic element used in alloys; occurs in niobite; formerly called columbium | Synonyms: atomic number 41, Nb |
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| nitrobacterium | (noun) any of the bacteria in the soil that take part in the nitrogen cycle; they oxidize ammonium compounds into nitrites or oxidize nitrites into nitrates | - |
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| nobelium | (noun) a radioactive transuranic element synthesized by bombarding curium with carbon ions; 7 isotopes are known | Synonyms: atomic number 102, No |
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| noncolumned | (adjective) not having columns | Synonyms: uncolumned |
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| nonhuman | (adjective) not human; not belonging to or produced by or appropriate to human beings | - |
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| nonruminant | (adjective) not ruminant | - |
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| nostrum | (noun) patent medicine whose efficacy is questionable | - |
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| (noun) hypothetical remedy for all ills or diseases; once sought by the alchemists | Synonyms: catholicon, cure-all, panacea |
| noumenon | (noun) the intellectual conception of a thing as it is in itself, not as it is known through perception | Synonyms: thing-in-itself |
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| numb | (adjective) so frightened as to be unable to move; stunned or paralyzed with terror; petrified | - |
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| (adjective) lacking sensation | Synonyms: asleep, benumbed |
| (adjective) (followed by `to') not showing human feeling or sensitivity; unresponsive | Synonyms: dead |
| (verb) make numb or insensitive | Synonyms: benumb, blunt, dull |
| numbat | (noun) small Australian marsupial having long snout and strong claws for feeding on termites; nearly extinct | Synonyms: anteater, banded anteater, Myrmecobius fasciatus |
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| number | (noun) an item of clothing | - |
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| (noun) the property possessed by a sum or total or indefinite quantity of units or individuals | Synonyms: figure |
| (noun) a clothing measurement | - |
| (noun) one of a series published periodically | Synonyms: issue |
| (noun) a symbol used to represent a number | Synonyms: numeral |
| (noun) a numeral or string of numerals that is used for identification and may be attached to accounts, memberships, etc. | - |
| (noun) the number is used in calling a particular telephone | Synonyms: phone number, telephone number |
| (noun) a short performance that is part of a longer program | Synonyms: act, bit, routine, turn |
| (noun) the grammatical category for the forms of nouns and pronouns and verbs that are used depending on the number of entities involved (singular or dual or plural) | - |
| (noun) a numbered item in a series | - |
| (noun) a select company of people | - |
| (noun) a concept of quantity involving zero and units | - |
| (verb) place a limit on the number of | Synonyms: keep down |
| (verb) determine the number or amount of | Synonyms: count, enumerate, numerate |
| (verb) enumerate | Synonyms: list |
| (verb) give numbers to | - |
| (verb) add up in number or quantity | Synonyms: add up, amount, come, total |
| (verb) put into a group | Synonyms: count |
| numbering | (noun) a numbered list | Synonyms: enumeration |
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| numberless | (adjective) too numerous to be counted | Synonyms: countless, infinite, innumerable, innumerous, multitudinous, myriad, uncounted, unnumberable, unnumbered, unnumerable |
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| numberplate | (noun) a plate mounted on the front and back of car and bearing the car's registration number | Synonyms: license plate |
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| numbers | (noun) an illegal daily lottery | Synonyms: numbers game, numbers pool, numbers racket |
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| numbfish | (noun) any sluggish bottom-dwelling ray of the order Torpediniformes having a rounded body and electric organs on each side of the head capable of emitting strong electric discharges | Synonyms: crampfish, electric ray, torpedo |
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| numbing | (adjective) causing numbness or insensitivity | - |
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| numbly | (adverb) in a numb manner; without feeling | Synonyms: insensibly |
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| numbness | (noun) the trait of lacking enthusiasm for or interest in things generally | Synonyms: apathy, indifference, spiritlessness |
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| (noun) partial or total lack of sensation in a part of the body; a symptom of nerve damage or dysfunction | - |
| numdah | (noun) an embroidered rug made from a coarse Indian felt | Synonyms: nammad, numdah rug |
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| numen | (noun) a spirit believed to inhabit an object or preside over a place (especially in ancient Roman religion) | - |
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| numerable | (adjective) that can be counted | Synonyms: countable, denumerable, enumerable |
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| numeracy | (noun) skill with numbers and mathematics | - |
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| numeral | (adjective) of or relating to or denoting numbers | Synonyms: numeric, numerical |
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| (noun) a symbol used to represent a number | Synonyms: number |
| (noun) a word expressing a number. | - |
| numerate | (adjective) able to understand and use numbers | - |
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| (verb) read out loud as words written numbers | - |
| (verb) determine the number or amount of | Synonyms: count, enumerate, number |
| numeration | (noun) the act of counting; reciting numbers in ascending order | Synonyms: count, counting, enumeration, reckoning, tally |
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| (noun) naming numbers | - |
| numerator | (noun) the dividend of a fraction | - |
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| numeric | (adjective) of or relating to or denoting numbers | Synonyms: numeral, numerical |
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| (adjective) measured or expressed in numbers | Synonyms: numerical |
| numerical | (adjective) relating to or having ability to think in or work with numbers | Synonyms: mathematical |
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| (adjective) of or relating to or denoting numbers | Synonyms: numeral, numeric |
| (adjective) measured or expressed in numbers | Synonyms: numeric |
| numerically | (adverb) in number; with regard to numbers | - |
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| numerological | (adjective) of or relating to numerology | - |
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| numerologist | (noun) a believer in numerology | - |
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| numerology | (noun) the study of the supposed occult influence of numbers on human affairs | - |
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| numerosity | (noun) a large number | Synonyms: multiplicity, numerousness |
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| numerous | (adjective) amounting to a large indefinite number | Synonyms: legion |
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| numerousness | (noun) a large number | Synonyms: multiplicity, numerosity |
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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 | - |
| numismatics | (noun) the collection and study of money (and coins in particular) | Synonyms: coin collecting, coin collection, numismatology |
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| numismatist | (noun) a collector and student of money (and coins in particular) | Synonyms: coin collector, numismatologist |
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| numismatologist | (noun) a collector and student of money (and coins in particular) | Synonyms: coin collector, numismatist |
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| numismatology | (noun) the collection and study of money (and coins in particular) | Synonyms: coin collecting, coin collection, numismatics |
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| nummulite | (noun) large fossil protozoan of the Tertiary period | - |
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| numskull | (noun) a stupid person; these words are used to express a low opinion of someone's intelligence | Synonyms: blockhead, bonehead, dumbass, dunce, dunderhead, fuckhead, hammerhead, knucklehead, loggerhead, lunkhead, muttonhead, shithead |
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| oakum | (noun) loose hemp or jute fiber obtained by unravelling old ropes; when impregnated with tar it was used to caulk seams and pack joints in wooden ships | - |
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| odium | (noun) hate coupled with disgust | Synonyms: abhorrence, abomination, detestation, execration, loathing |
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| (noun) state of disgrace resulting from detestable behavior | - |
| odontoglossum | (noun) any of numerous and diverse orchids of the genus Odontoglossum having racemes of few to many showy usually large flowers in many colors | - |
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| oecumenic | (adjective) concerned with promoting unity among churches or religions | Synonyms: ecumenic, ecumenical, oecumenical |
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| oecumenical | (adjective) of worldwide scope or applicability | Synonyms: cosmopolitan, ecumenical, general, universal, world-wide, worldwide |
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| (adjective) concerned with promoting unity among churches or religions | Synonyms: ecumenic, ecumenical, oecumenic |