/ Dictionary / Index N nonoxynol-9: Meaning and Definition of Find definitions for: non•ox•y•nol-9 Pronunciation: (no-nok'su-nôl"nīn', -nol"-), [key] — n. Pharm. the active ingredient of spermicides. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. no-nonsense nonparametric Related Content Daily Word Quiz: agitated Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language