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ninety the number represented by the Arabic numeral 90 and by the Roman numeral XC. [5 definitions]
Nineveh the capital of ancient Assyria.
ninja a specially trained feudal Japanese warrior used as a spy, assassin, or saboteur.
ninny a silly or foolish person.
ninth indicating rank or position between eighth and tenth. [4 definitions]
niobium a chemical element that has forty-one protons in each nucleus and that occurs in pure form as a dense, soft, shiny bluish white solid metal, used esp. in alloys of steel to add strength; columbium. (symbol: Nb)
nip1 to press sharply between two points or surfaces, as by biting or pinching. [8 definitions]
nip2 a small sip or drink of liquor. [2 definitions]
nip and tuck very close; almost even, as in a race.
nip in the bud to prevent from developing, growing, or being realized.
nipper something or someone that nips. [2 definitions]
nipple the projection at the center of a mammal's breast that, in the female, contains the outlets from the milk glands; teat. [3 definitions]
Nippon see Japan.
nippy sharply cold; frosty. [2 definitions]
nirvana (often cap.) in Buddhism or Hinduism, a state of blissful peace and harmony beyond the sufferings and passions of individual existence; state of oneness with eternal spirit. [2 definitions]
Nisan the seventh month of the Jewish lunisolar calendar, occurring from late March through early April in the Gregorian calendar.
Nisei (sometimes l.c.) an offspring of Japanese immigrant parents who is raised and educated in the United States or Canada. (See Issei, Kibei, Sansei.)
nit the egg or young of a louse or other parasitic insect.
niter a whitish salt, potassium nitrate or sodium nitrate, used in gunpowder or fertilizer; saltpeter.
nitpick to be excessively concerned with or critical of small details or faults.
nitrate a salt or ester containing nitric acid. [3 definitions]