diaphragm
//ˈdaɪ.ə.fræm//
Noun
diaphragmSingular
diaphragmsPlural
1
A dome-shaped muscular partition separating the thorax from the abdomen in mammals, playing a major role in breathing.
The diaphragm contracts when you inhale, allowing the lungs to expand.
2
A thin flexible membrane or disc that vibrates when receiving or producing sound waves, used in telephones, microphones, and loudspeakers.
The diaphragm in this microphone is very sensitive to sound.
3
A thin contraceptive cap fitting over the cervix.
The doctor explained how to properly insert a diaphragm for contraception.
4
A device for varying the effective aperture of the lens in a camera or other optical system.
Adjust the diaphragm to control the amount of light entering the camera.