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

See also: anestrous