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jelly coat

American  

noun

Biochemistry.

  1. an ovum-produced glycoprotein that causes adhesion of sperm to the ovum; fertilizin.

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Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.