/ Dictionary / Index P phosphamidon: Meaning and Definition of Find definitions for: phos•pham•i•don Pronunciation: (fos-fam'i-don"), [key] — n. Chem. a systemic and contact insecticide, CHClNOP, used against beetles, aphids, mites, and other crop pests. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. phosphagen phosphatase Related Content Daily Word Quiz: dissonant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language