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schlieren
schlie·ren S0137400 (shlîr′ən)pl.n.1. Geology Irregular dark or light streaks in plutonic igneous rock that differ in composition from the principal mass.2. Regions of a transparent medium, as of a flowing gas, that are visible because their densities are different from that of the bulk of the medium.
[German, pl. of Schliere, from dialectal Shliere, streaks, from Middle High German slier, mud, slime, from Old High German sclierrun, pieces, bits.]schlieren (ˈʃlɪərən) pl n, sing schliere1. (General Physics) physics visible streaks produced in a transparent medium as a result of variations in the medium's density leading to variations in refractive index. They can be recorded by flash photography (schlieren photography)2. (Geological Science) streaks or platelike masses of mineral in a rock mass, that differ in texture or composition from the main mass[German, plural of Schliere streak] ˈschlieric adjschlie•ren (ˈʃlɪər ən)
n.pl. 1. streaks or irregularly shaped masses in an igneous rock that differ in texture or composition from the main mass. 2. Physics. visible streaks produced by density variations in a turbulent fluid. [1885–90; < German, pl. of Schliere streak] schlieren
schlieren[′shlir·ən] (optics) In atmospheric optics, parcels or strata of air having densities sufficiently different from that of their surroundings so that they may be discerned by means of refraction anomalies in transmitted light. (petrology) Irregular streaks with shaded borders in some igneous rocks, representing the segregation of light and dark minerals or altered inclusions, elongated by flow. |