Search Result for "estrus": 
Wordnet 3.0

NOUN (1)

1. applies to nonhuman mammals: a state or period of heightened sexual arousal and activity;
[syn: estrus, oestrus, heat, rut]



WordNet (r) 3.0 (2006):

estrus
    n 1: applies to nonhuman mammals: a state or period of
         heightened sexual arousal and activity [syn: estrus,
         oestrus, heat, rut] [ant: anestrum, anestrus,
         anoestrum, anoestrus]