/ Dictionary / Index A acrospire: Meaning and Definition of Find definitions for: ac•ro•spire Pronunciation: (ak'ru-spīr"), [key] — n. Bot. the first sprout appearing in the germination of grain; the developed plumule of the seed. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. acrosome acrospore Related Content Daily Word Quiz: sumptuous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language