Category:Diaphragm

Di"a*phragm, n. Etym: [L. diaphragma, Gr. fareire to stuff: cf. F. diaphragme. See Farce.]

1. A dividing membrane or thin partition, commonly with an opening through it.

2. (Anat.)

Defn: The muscular and tendinous partition separating the cavity of the chest from that of the abdomen; the midriff.

3. (Zoöl.)

Defn: A calcareous plate which divides the cavity of certain shells into two parts.

4. (Opt.)

Defn: A plate with an opening, which is generally circular, used in instruments to cut off marginal portions of a beam of light, as at the focus of a telescope.

5. (Mach.)

Defn: A partition in any compartment, for various purposes. Diaphragm pump, one in which a flexible diaphragm takes the place of a piston.