Microturbulence is a form of turbulence that varies over small distance scales. (Large-scale turbulence is called macroturbulence.) ==Stellar== Microturbulence is one of several mechanisms that can cause broadening of the absorption lines in the stellar spectrum. Stellar microturbulence varies with the effective temperature and the surface gravity...
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http://en.wikipedia.org/wiki/Microturbulence
Small-scale motions (up to 5 km/s) in a stellar atmosphere that broaden the star`s spectral lines and may contribute to their effective width. In practice, astronomers may attribute any broadening of a spectral line, not accounted for by known causes, such as motions of the emitting atoms, to microt...
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http://www.daviddarling.info/encyclopedia/M/microturbulence.html
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