optical diaphragm

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• diaphragm — 1. noun /ˈdaɪəˌfræm/ a) In mammals, a sheet of muscle separating the thorax from the abdomen, contracted and relaxed in respiration to draw air into and expel air from the lungs; also called thoracic diaphragm. b) Any of various membranes or… …   Wiktionary

• diaphragm — ► NOUN 1) a dome shaped muscular partition separating the thorax from the abdomen in mammals. 2) a taut flexible membrane in mechanical or acoustic systems. 3) a thin contraceptive cap fitting over the cervix. 4) a device for varying the… …   English terms dictionary

• Optical aberration — v · d · e Optical aberration …   Wikipedia

• Diaphragm (optics) — A 35 mm lens set to f/8; the diameter of the seven sided entrance pupil, the virtual image of the opening in the iris diaphragm, is 4.375 mm In optics, a diaphragm is a thin opaque structure with an opening (aperture) at its center. The role of… …   Wikipedia

• Optical microscope — Microscope Uses Small sample observation Notable experiments Discovery of cells Inventor Hans Lippershey Zacharias Jans …   Wikipedia

• diaphragm — 1. The musculomembranous partition between the abdominal and thoracic cavities. SYN: diaphragma (2) [TA], interseptum, midriff, phren (1). 2. A thin disk pierced with an opening, used in a microscope, camera, or other op …   Medical dictionary

• 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… …   Universalium

• diaphragm — di•a•phragm [[t]ˈdaɪ əˌfræm[/t]] n. 1) anat. a wall of muscle and connective tissue separating two cavities, esp. the partition separating the thoracic cavity from the abdominal cavity in mammals 2) chem. a) a porous plate separating two liquids… …   From formal English to slang

• diaphragm — n. 1 a muscular partition separating the thorax from the abdomen in mammals. 2 a partition in animal and plant tissues. 3 a disc pierced by one or more holes in optical and acoustic systems etc. 4 a device for varying the effective aperture of… …   Useful english dictionary

• diaphragm — noun Etymology: Middle English diafragma, from Late Latin diaphragma, from Greek, from diaphrassein to barricade, from dia + phrassein to enclose Date: 14th century 1. a body partition of muscle and connective tissue; specifically the partition… …   New Collegiate Dictionary

• diaphragm — [ dʌɪəfram] noun 1》 a dome shaped muscular partition separating the thorax from the abdomen in mammals. 2》 a thin sheet of material forming a partition.     ↘a taut flexible membrane in mechanical or acoustic systems. 3》 a thin contraceptive cap… …   English new terms dictionary