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acrosome

[ak-ruh-sohm]
noun Cell Biology.
  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.
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Origin of acrosome

1895–1900; < German Akrosoma; see acro-, -some3
Related formsac·ro·so·mal, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for acrosome

Historical Examples

  • The acrosome seems to develop directly out of the cytoplasm.

    Studies in Spermatogenesis

    Nettie Maria Stevens

  • Spermatids containing both the chromatin nucleolus (n) and the odd chromosome (x), a the acrosome.

    Studies in Spermatogenesis

    Nettie Maria Stevens


British Dictionary definitions for acrosome

acrosome

noun
  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
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Word Origin

C19: from acro- + -some ³
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

acrosome in Medicine

acrosome

(ăkrə-sōm′)
n.
  1. acrosomal cap
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Related formsac′ro•somal (-sōməl) adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.