from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Stimulating blood flow in the pelvic area and uterus, causing menstruation.
from The Century Dictionary and Cyclopedia
- Of or pertaining to an emmenagogue; promoting menstruation.
Sorry, no etymologies found.
The plant isn't directly emmenagogic, however, but recommended for regulating the menstrual cycle and preventing cramps, etc.