catamenia
plural noun
cat·a·me·nia ˌka-tə-ˈmē-nē-ə 
: menses
catamenial
ˌka-tə-ˈmē-nē-əl
adjective 
Word History
Etymology
New Latin, from Greek katamēnia, from neuter plural of katamēnios monthly, from kata by + mēn month — more at cata-, moon
First Known Use
1750, in the meaning defined above
Medical Definition
catamenia
noun plural
cata·me·nia ˌkat-ə-ˈmē-nē-ə
: menses