Function: noun
Date: 1912
: the cycle of physiological changes from the beginning of one menstrual period to the beginning of the next
Function: noun
Date: 1912
: the cycle of physiological changes from the beginning of one menstrual period to the beginning of the next
Merriam Webster Collegiate English Dictionary. Merriam Webster - Энциклопедический словарь английского языка. 2012