bifid thumb

bi·fid thumb

a congenital malformed thumb where the distal phalanx is divided. preaxial duplication that may occur at any level; most common type involves two duplicated proximal phalanges supported by a bifid metacarpal head. Bifid thumb occurs most commonly in Asians, less commonly in whites, least commonly in African-Americans.
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Construction of one good thumb from both parts of a congenitally bifid thumb.