'monestrous' definitions:

Definition of 'monestrous'

(from WordNet)
adjective
Having one estrous cycle per year [syn: monestrous, monoestrous]

Definition of 'monestrous'

From: GCIDE
  • monestrous \mon*es"trous\, a. (Zool.) Having only one estrus period per breeding cycle or per year; -- of certain mammals. [PJC]