| 单词 | estrous cycle |
| 释义 | estrous cycle in American English the regular female reproductive cycle of most placental mammals that is under hormonal control and includes a period of heat, followed by ovulation and complex changes of the uterine lining estrous cycle in American Englishnoun a series of physiological changes in sexual and other organs in female mammals, extending from one period of heat to the next, accompanied by behavioral changes indicating interest in mating Word origin [1895–1900]This word is first recorded in the period 1895–1900. Other words that entered Englishat around the same time include: calling card, cutback, flamenco, frame of reference, freewheel |
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