MENSTRUAL CYCLE
\mˈɛnstɹuːə͡l sˈa͡ɪkə͡l], \mˈɛnstɹuːəl sˈaɪkəl], \m_ˈɛ_n_s_t_ɹ_uː_əl s_ˈaɪ_k_əl]\
Definitions of MENSTRUAL CYCLE
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a recurring cycle (beginning at menarche and ending at menopause) in which the endometrial lining of the uterus prepares for pregnancy; if pregnancy does not occur the lining is shed at menstruation; "the average menstrual cycle is 28 days"
By Princeton University
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Quinones
- Hydrocarbon rings which contain two moieties position. They can be substituted in any position except at the ketone groups.