micrometre.
An SI and mks unit of measure, the length of one-millionth of a metre. Symbol: μm, um, μ.
Meaning & usage
An SI and mks unit of measure, the length of one-millionth of a metre. Symbol: μm, um, μ.
Where this word comes from
Etymology tree Proto-Indo-European *mey-der.? Ancient Greek μῑκρός (mīkrós) Ancient Greek μῑκρο- (mīkro-)lbor. English micro- English metre English micrometre From micro- + metre.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.