/ Dictionary / Index A acrosome: Meaning and Definition of Find definitions for: ac•ro•some Pronunciation: (ak'ru-sōm"), [key] — n. Cell Biol. an organelle covering the head of animal sperm and containing enzymes that digest the egg cell coating, thus permitting the sperm to enter the egg. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: acrosome (Thesaurus) acropolis acrospire 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