- Also called micrometer. the millionth part of a meter. Symbol: μ, mu
- Physical Chemistry. a colloidal particle whose diameter is between 0.2 and 10 microns.
- Physics. a very small unit of pressure, equal to that exerted by a column of mercury 1μ high.
Origin of micron
1880–85; < Greek mīkrón a little, noun use of neuter singular of mīkrós small; see -on1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for micron
Most of the particles generated by burning wood are smaller than one micron—a size believed to be most damaging to our lungs.The Fireplace Delusion: A Metaphor for Religious Belief
February 3, 2012
The man who studies bacteria measures by the micron, 25,000 of which go to the inch.Rustic Sounds
But with the destruction of the planet an almost certainty, the collective nervous system was just one micron away from explosion.Alien Offer
This unit is the one-thousandth part of a millimeter and is called the micro-millimeter or micron.The Fundamentals of Bacteriology
Charles Bradfield Morrey
Their size is measured by the unit used in the microscope, called the micron, which is about 1⁄25000 of one inch.Foods and Household Management
- a unit of length equal to 10 –6 metre. It is being replaced by the micrometre, the equivalent SI unit
C19: New Latin, from Greek mikros small
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Word Origin and History for micron
"one millionth of a meter," 1892, coined 1880 in French from Greek mikron, neuter of mikros "small" (see mica).
Online Etymology Dictionary, © 2010 Douglas Harper
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
- See micrometer2.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.