schlieren
schlie·ren
noun pl \ˈshlir-ən\Definition of SCHLIEREN
1
: small masses or streaks in an igneous rock that differ in composition from the main body
2
: regions of varying refraction in a transparent medium often caused by pressure or temperature differences and detectable especially by photographing the passage of a beam of light
— schlie·ric \ˈshlir-ik\ adjective
Origin of SCHLIEREN
German
First Known Use: 1898
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