The Collaborative International Dictionary
                    anestrous
                    
                        
                
                                                                    anestrous \anestrous\ adj.
of or pertaining to anestrus.
not in a state of estrus; not in heat; -- of lower mammals; as, an anestrous bitch. Opposite of estrous.
Wiktionary
                    anestrous
                    
                        
                
                                                                    a. 1 of, or pertaining to, anestrus 2 not estrous
WordNet
                    anestrous
                    
                        
                
                                                                    adj. of or relating to anestrus [syn: anestric, anoestrous]
(of lower mammals) not in a state of estrus; not in heat; "an anestrous bitch" [ant: estrous]