2. A contraceptive device consisting of a dome-shaped, spring-rimmed, latex cup filled with a spermicidal jelly or cream and placed in the vagina to fit over the cervix and prevent sperm from entering the uterus; it should be inserted up to 2 hours prior to intercourse and left undisturbed for 6 to 8 hours subsequently (the spermicide is only effective for 12 hours and needs at least 6 hours to kill sperm). Diaphragms are available in sizes ranging from 5.5 to 10 centimeters in diameter; since they can slip during intercourse they are rated as only 80-95% effective; if used in conjunction with a spermicidal jelly or cream, it helps prevent infection and the spread of STDs and AIDS. The diaphragm was invented in 1882.
Synonyms: cap; catcher's mitt; catskin; cervical cap; collapsible container; contraceptive cap; contraceptive diaphragm; Dutch cap; flying saucer; French cap; fuck-plug; hat; jelly loop; little flying saucer; Malthus cap; phragmie (phragmmie); rubber cookie; sex cap; shower cap; sombrero.
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