Diaphragm (noun)

1. A thin, flat muscle that separates the thorax from the abdomen in mammals and is involved in breathing.
2. A contraceptive device made of latex or silicone that is inserted into the vagina to prevent pregnancy.
3. A thin plate used to separate two spaces or to control the flow of a substance.

Origin:

Derived from the greek word 'diaphragma' meaning 'partition' or 'screen'.

Examples:

1. The diaphragm helps to control the flow of air into and out of the lungs during respiration.
2. The diaphragm is a popular form of birth control that is safe and effective.
3. The diaphragm in a camera controls the amount of light that enters the lens.
4. The diaphragm in a pump helps to regulate the flow of fluid.
5. The diaphragm in a speaker helps to produce sound by vibrating.