メンス

noun

menstruation; menses

Dated medical/technical term borrowed from German; in modern Japanese 月経 or 生理 are far more common.

from German Mens(truation)

See also: 月経

• 昔むかしの医い学がく書しょには「メンス」という言こと葉ばがよく出でてくる。

  The word メンス often appears in old medical books.