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Adjective: anestrous
  1. Of or relating to anestrus
    - anestric, anoestrous
  2. (of lower mammals) not in a state of estrus; not in heat
    "an anestrous bitch"

See also: diestrous [N. Amer], diestrual [N. Amer], dioestrous [Brit, Cdn], dioestrual [Brit, Cdn]

Antonym: estrous