Pronunciation: (mī'kron), [key]
—pl. -crons, -craPronunciation: (-kru). [key]
1. Also called micrometer. the millionth part of a meter. Symbol: μ, mu
2. Physical Chem.a colloidal particle whose diameter is between 0.2 and 10 microns.
3. Physics.a very small unit of pressure, equal to that exerted by a column of mercury 1μ high. Also,mikron.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.