schlieren

plural noun

schlie·ren ˈshlir-ən

: small masses or streaks in an igneous rock that differ in composition from the main body

: 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

schlieric

ˈshlir-ik

adjective

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All images were taken at 8000 frames per second, using schlieren photography. —