amenorrhoea

n. absence of menstruation

Amenorrhoea (BE), amenorrhea (AmE), or amenorrhœa, is the absence of a menstrual period in a woman of reproductive age. Physiologic 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 amenorrhea method. Outside of the reproductive years there is absence of menses during childhood and after menopause.
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The absence of menstrual periods is called amenorrhea. Primary amenorrhea is the failure to start having a period by the age [more]Amenorrhoea - Community and Resources

Noun
1. absence or suppression of normal menstrual flow
(synonym) amenorrhea, amenia
(hypernym) symptom
(hyponym) primary amenorrhea

(n.)
Retention or suppression of the menstrual discharge.