| nicad | (noun) a rechargeable battery with a nickel cathode and a cadmium anode; often used in emergency systems because of its low discharge rate when not in use | Synonyms: nickel-cadmium accumulator |
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| niceness | (noun) the quality of nice | - |
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| (noun) the quality of being difficult to detect or analyze | Synonyms: subtlety |
| (noun) a courteous manner that respects accepted social usage | Synonyms: politeness |
| nicety | (noun) conformity with some esthetic standard of correctness or propriety | Synonyms: justness, rightness |
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| (noun) a subtle difference in meaning or opinion or attitude | Synonyms: nuance, refinement, shade, subtlety |
| niche | (noun) an enclosure that is set back or indented | Synonyms: recess |
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| (noun) a small concavity | Synonyms: corner, recess, recession |
| (noun) a position particularly well suited to the person who or organization which occupies it | - |
| (noun) (ecology) the status of an organism within its environment and community (affecting its survival as a species) | Synonyms: ecological niche |
| nick | (noun) a small cut | Synonyms: notch, snick |
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| (noun) (British slang) a prison | - |
| (noun) an impression in a surface (as made by a blow) | Synonyms: dent, ding, gouge |
| nickel | (noun) a United States coin worth one twentieth of a dollar | - |
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| (noun) five dollars worth of a drug | Synonyms: nickel note |
| (noun) a hard malleable ductile silvery metallic element that is resistant to corrosion; used in alloys; occurs in pentlandite and smaltite and garnierite and millerite | Synonyms: atomic number 28, Ni |
| nickelodeon | (noun) a cabinet containing an automatic record player; records are played by inserting a coin | Synonyms: jukebox |
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| nicker | (noun) the characteristic sounds made by a horse | Synonyms: neigh, whicker, whinny |
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| nicknack | (noun) miscellaneous curios | Synonyms: bric-a-brac, knickknack, knickknackery, whatnot |
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| nickname | (noun) a familiar name for a person (often a shortened version of a person's given name) | Synonyms: byname, cognomen, moniker, sobriquet, soubriquet |
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| (noun) a descriptive name for a place or thing | - |
| nicotine | (noun) an alkaloid poison that occurs in tobacco; used in medicine and as an insecticide | - |
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| nictation | (noun) a reflex that closes and opens the eyes rapidly | Synonyms: blink, blinking, eye blink, nictitation, wink, winking |
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| nictitation | (noun) a reflex that closes and opens the eyes rapidly | Synonyms: blink, blinking, eye blink, nictation, wink, winking |
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