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Definition

noun

The fertilization of an ovum by only one sperm.

Supplement

The ovum when fertilized by a sperm forms a fertilization membrane to prevent penetration of other sperms.

Word origin: Greek, mónos, alone + Greek -spermos, from sperma, seed + -y.
Related forms: polyspermic (adjective).

Compare: polyspermy.
See also: fertilization.