Noun
karyogamy (countable and uncountable, plural karyogamies)
(biology) The fusion of two nuclei within a cell, especially as the second stage of syngamy.
Plasmogamy between compatible individuals leads to delayed karyogamy leading to establishment of a dikaryon. Source: Internet
The result of karyogamy is a diploid cell called a zygote or zygospore. Source: Internet
Unlike in animals and plants, plasmogamy is not immediately followed by the merging of the nuclei (called karyogamy ). Source: Internet