Pronunciation: (shlēr'un), [key]
—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.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.