cat·a·me·nia \ˌkad.əˈmēnēə, -nyə\noun plural but singular or plural in construction Etymology: New Latin, from Greek katamēnia, neuter plural of katamēnios monthly, from kata- cata- + -mēn month — more at moon : menses • cat·a·me·ni·al\| ̷ ̷ ̷ ̷| ̷ ̷nēəl, -nyəl\adjective