oestrous Definition
oestrusestrusnoun 1. zool.physiol.A regularly occurring but restricted period of sexual receptivity that occurs in most female mammals apart from humans. See also in or on heat at heat.
Derivative: oestrous
adj
Derivative: oestral
adj
Etymology: 19c; 17c meaning ‘a biting insect of the genus
Oestrus': from Greek
oistros a gadfly noted for its frenzy.