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a viscous membrane formed on the inner surface of the vitelline membrane from the cytoplasm of the egg cell after entry of the sperm, preventing the entry of additional sperm.
Farlex Partner Medical Dictionary © Farlex 2012
fertilization membranea membrane that appears at the surface of the egg after FERTILIZATION. It is effectively a thickened VITELLINE MEMBRANE that may separate from the surface of the egg; it prevents the entry of additional sperms.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005