Diaphragm
Diaphragm , noun
[Latin diaphragma, Greek {not transcribed}, from {not transcribed} to fence by a partition wall; dia` through + {not transcribed}, {not transcribed}, to fence, inclose; prob. akin to Latin fareire to stuff: compare French diaphragme. See Farce.]
1.
A dividing membrane or thin partition, commonly with an opening through it.
2.
(Anatomy) The muscular and tendinous partition separating the cavity of the chest from that of the abdomen; the midriff.
3.
(Zoology) A calcareous plate which divides the cavity of certain shells into two parts.
4.
(Optics) 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.
(Machinery) A partition in any compartment, for various purposes.
Collocations (1)
Diaphragm pump , one in which a flexible diaphragm takes the place of a piston.