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Wiktionary
cervical cap

n. a small, latex or silicone, contraceptive device that fits over the cervix and stays in place either by suction, like Prentif or by surface viscosity, like Oves.

WordNet
cervical cap

n. a contraceptive device consisting of a small thimble-shaped cup that is placed over the uterine cervix to prevent the entrance of spermatozoa

Wikipedia
Cervical cap

The cervical cap is a form of barrier contraception. A cervical cap fits over the cervix and blocks sperm from entering the uterus through the external orifice of the uterus, called the os.