micrometre

Noun. An SI/MKS unit of measure, the length of one one-millionth of a metre. Symbol: µm, um, rm.

This is an unmodified, but possibly outdated, definition from Wiktionary and used here under the Creative Commons license. Wiktionary is a great resource. If you like it too, please donate to Wikimedia.

This entry was last updated on RefTopia from its source on 3/20/2012.