equilenin
noun
equi·len·in
| \ ˌek-wə-ˈlen-ən
, ə-ˈkwil-ə-nən
\
, ə-ˈkwil-ə-nən
\
Medical Definition of equilenin
: a weakly estrogenic steroid hormone C18H18O2 obtained from the urine of pregnant mares