1.Definition: (anatomy) a muscular partition separating the abdominal and thoracic cavities; functions in respiration

Related Noun(s):midriff

Category: General

2.Definition: 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

Related Noun(s):pessary

Category: Objects

3.Definition: a mechanical device in a camera that controls size of aperture of the lens

"The new cameras adjust the diaphragm automatically"

Related Noun(s):stop

Category: Objects

4.Definition: electro-acoustic transducer that vibrates to receive or produce sound waves

Category: Objects