1. diaphragm (sheet of muscle separating the thorax from the abdomen) (anatomy)

2. diaphragm (contraceptive device consisting of a flexible cup)

3. diaphragm (thin, opaque structure with a central aperture) (photography)

4. diaphragm (vibrating membrane in a speaker) (acoustics)

5. diaphragm (membrane that separates one cavity from another) (botany)

6. diaphragm (flexible membrane separating two chambers) (mechanics)