menstruation menstruation menstrual cycle phase menarche http://id.loc.gov/authorities/subjects/sh85083534 http://purl.obolibrary.org/obo/GO_0042696 http://purl.obolibrary.org/obo/NCIT_C3228 https://en.wikipedia.org/wiki/Menarche https://www.wikidata.org/wiki/Q492514 RJ145 E1.0.2.3.0.0.3 QP263 The beginning of the menstrual cycle; the first menstrual cycle in an individual. The first menstrual cycle marked by the initiation of menstruation. pubertet puberty The Wiley Blackwell Encyclopedia of Gender and Sexuality Studies