Atomic mass unit

Noun.  (chemistry) a unit of mass equal to 1/12 the mass of an atom of the 12C isotope of carbon.

This is an unmodified, but possibly outdated, definition from Wiktionary and used here under the Creative Commons license.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.