/ Dictionary / Index S sodium fluoride: Meaning and Definition of Find definitions for: so'dium fluor'ide Pronunciation: [key] a colorless, crystalline, water-soluble, poisonous solid, NaF, used chiefly in the fluoridation of water, as an insecticide, and as a rodenticide. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. sodium ethylate sodium fluoroacetate Related Content Daily Word Quiz: denizen Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language