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-.]
(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]