a metric unit of length equal to one millionth of a meter
"The quality control engineer measured the dust particles with a laser scanner, noting that each grain was only two microns in diameter."
The thousandth part of one millimeter; the millionth part of a meter.
"The artist measured the width of the finest ink line on her sketchbook to be exactly two microns, noting that such a tiny dimension was almost indistinguishable from a breve."
Synonym of breve