/ Dictionary / Index A amphi-: Meaning and Definition of Find definitions for: amphi- Pronunciation: [key] a prefix occurring in loanwords from Greek (amphibious); on this model, used with the meaning “two,” “both,” “on both sides,” in the formation of compound words: amphiaster. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. amphetamine Amphiaraus Related Content Daily Word Quiz: rotund Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language