estrous-cycle
US /ˈes.trəs ˌsaɪ.kəl/
UK /ˈiː.strəs ˌsaɪ.kəl/
名詞
発情周期
the series of physical changes that a female animal repeatedly goes through, during which she becomes fertile (= able to become pregnant) and willing to mate (= have sex):
例:
•
Female llamas do not go into "heat" or have an estrous cycle.