/ Dictionary / Index A amphioxus: Meaning and Definition of Find definitions for: am•phi•ox•us Pronunciation: (am"fē-ok'sus), [key] — pl. -ox•i -ox•us•es. lancelet. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: amphioxus (Thesaurus) Amphion amphipathic Related Content Daily Word Quiz: verdant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language