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1. fertilization of a large nonmotile egg by a small, motile male gamete or sperm, as seen in certain algae.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.
oogamya state in which male and female GAMETES of an organism are morphologically different, with the male gamete being motile and the female gamete nonmotile and often larger.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005