noun, plural mi·crons, mi·cra [mahy-kruh] /ˈmaɪ krə/.
- 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.
noun plural -crons or -cra (-krə)
- a unit of length equal to 10 –6 metre. It is being replaced by the micrometre, the equivalent SI unit
n.“one millionth of a meter,” 1892, coined 1880 in French from Greek mikron, neuter of mikros “small” (see mica). n. pl. mi•crons
- See micrometer2.