Norinyl is a prescription medication that is used as a form of birth control. It is a combination of two hormones, ethinyl estradiol and norethindrone, which work together to prevent pregnancy. While Norinyl may be a common name for the medication, there are several other names that it may go by. Some of the most commonly used synonyms for Norinyl include Loestrin, Ortho-Novum, Microgestin, and Femcon. These are all different brands of the same medication, but they may have slightly different dosages or combinations of hormones. Ultimately, no matter what name it goes by, Norinyl is an effective and popular choice for women looking to prevent pregnancy.