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heat▼(condition where a mammal is aroused sexually or where it is especially fertile)noun[UK: hiːt] [US: ˈhiːt]
oestrus [oestruses]▼(a female animal's readiness to mate)noun[UK: ˈiː.strəs] [US: ˈiː.strəs]
estrogen [estrogens]▼noun[UK: ˈe.strə.dʒən] [US: ˈe.strə.dʒən]
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