/ Dictionary / Index N nicotine: Meaning and Definition of Find definitions for: nic•o•tine Pronunciation: (nik'u-tēn", -tin, nik"u-tēn'), [key] — n. Chem. a colorless, oily, water-soluble, highly toxic, liquid alkaloid, CHN, found in tobacco and valued as an insecticide. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: nicotine (Thesaurus) nicotinamide adenine dinucleotide phosphate nicotinic Related Content Daily Word Quiz: arid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language