Also found in: Medical.


The formation during fertilization of the diploid number of chromosomes by the fusion of the nuclei of two haploid gametes.

[New Latin diplōsis, from Greek, a doubling, from diploun, to double, from diploos, double; see diplo-.]
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 the doubling of the haploid number of chromosomes that occurs during fusion of gametes to form a diploid zygote
[C20: from Greek diplōsis doubling, from diploun to double, from diploos double]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014