menarcheal

noun Physiology.

1. the first menstrual period; the establishment of menstruation.

noun

1. the first occurrence of menstruation in a woman’s life

n.1896, from German menarche (1895), from Greek men (genitive menos) “month” (see moon (n.)) + arkhe “beginning” (see archon). n.

1. The first menstrual period, usually during puberty.

1. The first menstrual period.