| 单词 | diaphragm |
| 释义 | diaphragm /duy"euh fram'/, n. 1. Anat. a. a muscular, membranous or ligamentous wall separating two cavities or limiting a cavity. b. the partition separating the thoracic cavity from the abdominal cavity in mammals. 2. Physical Chem. a. a porous plate separating two liquids, as in a galvanic cell. b. a semipermeable membrane. 3. a thin disk that vibrates when receiving or producing sound waves, as in a telephone, microphone, speaker, or the like. 4. Also called pessary. a thin, dome-shaped device, usually of rubber, for wearing over the uterine cervix during sexual intercourse to prevent conception. 5. a plate with a hole in the center or a ring that is placed on the axis of an optical instrument, as a camera, and that controls the amount of light entering the instrument. 6. a plate or web for stiffening metal-framed constructions. v.t. 7. to furnish with a diaphragm. 8. to reduce the aperture of (a lens, camera, etc.) by means of a diaphragm. [1350-1400; ME diafragma < LL diaphragma < Gk diáphragma the diaphragm, midriff, equiv. to dia- DIA- + phrágma a fence] |
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