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oral contraceptive

n :  any of various preparations that usu. contain a combination of a progestogen (as norethindrone) and an estrogen (as ethinyl estradiol) but sometimes only a progestogen, are taken orally esp. on a daily basis, and act as contraceptives typically by preventing ovulation by suppressing secretion of gonadotropins (as luteinizing hormone) .
 
 

 
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