Etymology
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micron (n.)

"one millionth of a meter," by 1883, coined in French from Greek mikron, neuter of mikros "small" (see micro-) and formally adopted Oct. 2, 1879, by the Comité International des Poids et Mesures. It was replaced 1968 by the micrometre.

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Definitions of micron

micron (n.)
a metric unit of length equal to one millionth of a meter;
Synonyms: micrometer
From wordnet.princeton.edu