n. A unit of length; the thousandth part of one millimeter; the millionth part of a meter.
the GNU version of the Collaborative International Dictionary of English
n. A measure of length; the thousandth part of one millimeter; the millionth part of a meter.
The Century Dictionary and Cyclopedia
n. The millionth part of a meter, or of an English inch.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. a metric unit of length equal to one millionth of a meter
Word Usage
"Spanish; another to express the more open vowels; another the less open vowels; for which the word micron is here used, and for which the word mega is here used."