polyspermy defined in 1951 yearpolyspermy - polyspermy;
polyspermy - Penetration of numerous sperm into one ovum at time of fertilization. Occurs normally in very yolky eggs (e.g. shark, bird); only one sperm nucleus fuses with egg nucleus, the rest taking little further part in development. May occur abnormally in other eggs, upsetting development.
near polyspermy in Knolik
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