adj. in a period of sexual inactivity; -- of animals that have several estrous cycles in one breeding season. Syn. -- diestrous, diestrual. [ WordNet 1.5 ]
a. [ See oestrus. ] (Physiol.) Of or pertaining to sexual desire; -- mostly applied to brute animals; as, the oestrual period; oestrual influence. [ 1913 Webster ]