n.
Pronunciation: ˌ no ̇ r- ' e-th ə n- ˌ dr ō n
Function: noun
Etymology: nor- + ethin yl + hy dr- + -one (as in progesterone )
Date: 1958
: a synthetic progestational hormone C 20 H 26 O 2 used in birth control pills often in the form of its acetate