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From Biology-Online Dictionary | Biology-Online Dictionary
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(1) Secretion of semen in profuse amount.

(2) Polyspermy.


In some references, polyspermia also refers to the high sperm count (through semen analysis) -- a condition more properly called as polyzoospermia.

Word origin: Greek polyspermía, abundance of seed.

Compare: aspermia, oligospermia.
See also: polyzoospermia.