WordReference Random House Unabridged Dictionary of American English © 2019
ac•ro•some  (akrə sōm′),USA pronunciation n. [Cell Biol.]
  1. 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.
ac′ro•somal, adj. 
  • German Akrosoma; see acro-, -some3
  • 1895–1900

Collins Concise English Dictionary © HarperCollins Publishers::

acrosome /ˈækrəˌsəʊm/ n
  1. a cap-like structure on the tip of a spermatozoon that releases enzymes on encountering the ovum allowing fusion with the ovum in the sexual reproductive process; this part of the process is known as the acrosome reaction
Etymology: 19th Century: from acro- + -some³


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