schlieren

About 0.14 uses per million words.

Meaning

1. noun Regions of a fluid having different refractive index because of their different density.
2. noun Irregular streaks of different composition in some igneous rocks.

Similar words

shadowgraph refraction dispersion birefringence photorefraction refractive index non-newtonian fluid constringence snell's law refringence

Often followed by

photographs method system and photograph photography optics optical technique image

Word family

schlierens schlieric