ovosiston

o·vo·sis·ton

(ō'vō-sis'tŏn),
An oral contraceptive that consists of a mixture of a progestin and an estrogen.
References in periodicals archive ?
(17) Ovosiston (2mg chlormadinone acetate, 0.1 mg mestranol) was shown in 1969 to be associated with a lower mean speaking frequency by 0.8 half-tone as well as an increase in vocal intensity by 5dB in lower third of pitch range.