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Definition of diaphragm : 1. A calcareous plate which divides the cavity of certain shells into two parts.
2. A dividing membrane or thin partition, commonly with an opening through it.
3. A partition in any compartment, for various purposes.
4. 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. The muscular and tendinous partition separating the cavity of the chest from that of the abdomen; the midriff.

Synonyms:

point, layover, breath, hitch, blow, bronchiole, middle, stop consonant, plosive, button, condom, answering machine, stoppage, abortionist, calling card, bronchus, midriff, bad breath, stopover, closure, breathing, asphyxia, blockage, plosive consonant, period, stop, contraception, full stop, bronchial tube, halt, artificial respiration, 3G, arrest, airway, bleeper, contraceptive, abortion, beeper, barrier method, cell, birth control, coil, pessary, block, plosive speech sound, occlusion, midsection, cameraphone, occlusive, card, full point, check, stay, 4G, catch, contraceptive diaphragm

Usage examples:

• I thereupon made a film of composition, as thin as possible, and stretched it upon the frame of my instrument, as a diaphragm behind the wires, hoping that the sound- waves would pass between the wires, and vibrate the diaphragm, which, being made of composition, would undoubtedly glow, but not more than the film had done. - "Zarlah the Martian", R. Norman Grisewood.
• By the contraction of its muscles the diaphragm is pulled down, thereby increasing the thoracic cavity. - "Physiology and Hygiene for Secondary Schools", Francis M. Walters, A.M..
• When the felt diaphragm machine was brought into the market it was advertised as a no- moisture machine. - "The Dollar Hen", Milo M. Hastings.