diaphragm
nounUK /ˈdaɪəfræm/
US /ˈdaɪəfræm/
A muscle under your lungs that helps you breathe.
When you take a deep breath, your diaphragm moves down.
RELATED WORDS
OTHER MEANINGS
2. A thin round part inside a camera or microphone that controls light or sound.
The camera's diaphragm opened wider to let in more light.
3. A thin barrier or disc used in machines to separate two areas.
The pump uses a rubber diaphragm to move the liquid.
4. A dome-shaped device worn inside the body to prevent pregnancy.
Her doctor explained how to use a diaphragm correctly.