zygote zygote /ˈzaɪgoʊt/

noun

1. (genetics) the diploid cell resulting from the union of a haploid spermatozoon and ovum (including the organism that develops from that cell)  ( fertilized ovum , zygote , fertilised ovum [British] )
   (genetics) the diploid cell resulting from the union of a haploid spermatozoon and ovum (including the organism that develops from that cell)