diaphragm : Idioms & Phrases
contraceptive diaphragm
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noun a contraceptive device consisting of a flexible dome-shaped cup made of rubber or plastic; it is filled with spermicide and fitted over the uterine cervix
diaphragm; pessary.
WordNet
Diaphragm pump
- one in which a flexible diaphragm takes the place of a piston.
Webster 1913
iris diaphragm
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noun diaphragm consisting of thin overlapping plates that can be adjusted to change the diameter of a central opening
iris.