/ Dictionary / Index A amphiaster: Meaning and Definition of Find definitions for: am•phi•as•ter Pronunciation: (am'fē-as"tur), [key] — n. Cell Biol. the achromatic spindle with two asters that forms during mitosis. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. amphiarthrosis Amphibia Related Content Daily Word Quiz: fresco Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language