/ Dictionary / Index A acephate: Meaning and Definition of Find definitions for: ac•e•phate Pronunciation: (as'u-fāt"), [key] — n. Chem. a white solid compound, CHNOPS, used as an insecticide against a wide range of plant pests, including aphids, budworms, and tent caterpillars. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. acephalous ace point Related Content Daily Word Quiz: mamba Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language