Mid 17th century; earliest use found in Thomas Browne (1605–1682), physician and author. From menstruum + -ant, in 17th-cent. use perhaps after post-classical Latin menstruant-, menstruans menstruating.
Definition of menstruant in US English:
menstruant
adjectiveˈmɛnstrʊənt
rare
Subject to menstruation; menstruating.
nounˈmɛnstrʊənt
rare
A menstruating woman.
Origin
Mid 17th century; earliest use found in Thomas Browne (1605–1682), physician and author. From menstruum + -ant, in 17th-cent. use perhaps after post-classical Latin menstruant-, menstruans menstruating.