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Definition of Unciform bone
1. Noun. The wrist bone in line with the 4th and 5th fingers.
Medical Definition of Unciform bone
1. The bone on the medial (ulnar) side of the distal row of the carpus; it articulates with the fourth and fifth metacarpal, triquetral, lunate, and capitate. Synonym: os hamatum, hamatum, hooked bone, unciform bone, unciforme, uncinatum. (05 Mar 2000)