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The entry of several sperm into one ovum during fertilization.

pol′y·sper′mic adj.
References in periodicals archive ?
In addition, polyspermic fertilization was reported in the giant scallop Placopecten magellanicus at a pH level less than 7.
Pronuclear location before the first cell division determines ploidy of polyspermic pig embryos.
The cells had been obtained from polyspermic embryos that had no chance of implanting in the uterus and that ordinarily would have been discarded.
The researchers used polyspermic embryos, which result when more than one sperm penetrates an egg.
However, the proportion of oocytes penetrated and containing male and female pronuclei exceeded 93% in all treatments and the proportion of polyspermic oocytes was significantly higher as the sperm concentration increased from 0.
Of those, 35 proved polyspermic and had to be discarded.
Growth retardation of inner cell mass cells in polyspermic porcine embryos produced in vitro.