# micrometre

> English word · Noun · IPA /ˈmaɪkɹəˌmiːtə(ɹ)/

## Definitions
1. An SI and mks unit of measure, the length of one-millionth of a metre. Symbol: μm, um, μ.

## Etymology
From micro- + metre.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/micrometre