acrosome

American  

[ak-ruh-sohm] / ˈæk rəˌsoʊm /

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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acrosome British  

/ ˈækrəˌsəʊm /

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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Other Word Forms

• acrosomal adjective

Etymology

Origin of acrosome

1895–1900; < German Akrosoma; acro-, -some ³

Example Sentences

That clearly means the fertilisation process; the bell ringing is the acrosome reaction, the wings are the newly formed pairs of chromosomes in the zygote, and thus life begins.

From The Guardian

The acrosome seems to develop directly out of the cytoplasm.

From Project Gutenberg