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schlieren

Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

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

from The Century Dictionary.

  • In petrography, streaks or irregularly shaped portions of an igneous rock which differ in texture or composition from the main mass.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun Regions of a fluid having different refractive index because of their different density
  • noun geology Irregular streaks of different composition in some igneous rocks

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[German, pl. of Schliere, from dialectal Shliere, streaks, from Middle High German slier, mud, slime, from Old High German sclierrun, pieces, bits.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

German streaks

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  1. schlieren photography

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