e·to·no·ges·trel 
(ē′tō-nôr-jĕstrəl, ĕt′ō-)
(ē′tō-nôr-jĕstrəl, ĕt′ō-)n.
A progestin, C22H28O2, used in contraceptives delivered through a subdermally implanted device and, in combination with estrogen, in contraceptives delivered by means of a ring placed within the vagina.
[(K)ETON(E) + (DES)OGESTREL.]