noun, plural mi·krons, mi·kra [mahy-kruh] /ˈmaɪ krə/.

  1. micron.

noun, plural mi·crons, mi·cra [mahy-kruh] /ˈmaɪ krə/.

  1. Also called micrometer. the millionth part of a meter. Symbol: μ, mu
  2. Physical Chemistry. 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.

noun plural -crons or -cra (-krə)

  1. 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.

  1. Variant ofmicron

n. pl. mi•crons

  1. micrometer2

  1. See micrometer2.

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