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schlieren

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(s̸hlir′ən)

plural noun sing. schliere

small streaks or masses in igneous rocks, differing in composition from the main rock but blending gradually into it
Optics regions in a translucent medium, as a fluid, that have a different density and consequently a different index of refraction than the medium and that can be photographed as shadows produced by the refraction of light passed through these regions

Origin: Ger, lit., streaks; akin to slur

See schlieren in American Heritage Dictionary 4

plural noun

Geology Irregular dark or light streaks in plutonic igneous rock that differ in composition from the principal mass.
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.

Origin:

Origin: German

Origin: , pl. of Schliere

Origin: , from dialectal Shliere, streaks

Origin: , from Middle High German slier, mud, slime

Origin: , from Old High German sclierrun, pieces, bits

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