/shlear"euhn/ , n. ( used with a pl. v. )
1. Petrog. streaks or irregularly shaped masses in an igneous rock that differ in texture or composition from the main mass.
2. Physics. the visible streaks in a turbulent, transparent fluid, each streak being a region that has a density and index of refraction differing from that of the greater part of the fluid.
[ 1885-90; Schliere streak ]