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Adjective: dioestrual
Usage: Brit, Cdn (US: diestrual)
  1. (of animals that have several estrous cycles in one breeding season) in a period of sexual inactivity
    "The dioestrual phase is important for reproductive health in many mammals";
    - diestrous [N. Amer], dioestrous [Brit, Cdn], diestrual [N. Amer]

See also: anestrous