extensor carpi radialis brevis
noun
extensor car·pi ra·di·al·is brev·is
| \ -ˈkär-ˌpī-ˌrā-dē-ˈā-ləs-ˈbrev-əs, -ˈkär-ˌpē-
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Medical Definition of extensor carpi radialis brevis
: a short muscle on the radial side of the back of the forearm that extends and may abduct the hand