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Of or relating to a one-celled organism in which sexual reproduction occurs by the fusion of two whole cells that act as gametes and resemble each other.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Biology) biology a type of reproduction in which the gametes are like ordinary cells in form and size, as is found in some algae and protozoa
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014