Search Result for "ovulation":
Wordnet 3.0

NOUN (1)

1. the expulsion of an ovum from the ovary (usually midway in the menstrual cycle); 



The Collaborative International Dictionary of English v.0.48:

ovulation \o`vu*la"tion\, n. (Physiol.)
   The formation of ova or eggs in the ovary, and the discharge
   of the same. In the human female the discharge occurs about
   halfway between menstruation times.
   [1913 Webster +PJC]