Monospermynoun
The fertilization of an oocyte by a single spermatozoon.
Polyspermynoun
(biology) The penetration of an ovum by more than one sperm.
Polyspermynoun
Fullness of sperm, or seed; the passage of more than one spermatozoön into the vitellus in the impregnation of the ovum.
Polyspermy
In biology, polyspermy describes an egg that has been fertilized by more than one sperm. Diploid organisms normally contain two copies of each chromosome, one from each parent.