Amenorrhoea (BE), amenorrhea (AmE), or amenorrhœa, is the absence of a menstrual period in a woman of reproductive age. Physiological states of amenorrhoea are seen during pregnancy and lactation (breastfeeding), the latter also forming the basis of a form of contraception known as the lactational amenorrhoea method. Outside of the reproductive years there is absence of menses during childhood and after menopause.
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Some articles on amenorrhoea:
... Syndrome, which refers to the association of galactorrhoea and amenorrhoea ... which refers to extended postpartum galactorrhoea and amenorrhoea ... Forbes-Albright Syndrome, which refers to galactorrhoea-amenorrhoea associated with a pituitary tumour ...