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Wikipedia definition
1. Cleft chinThe terms cleft chin, butt chin, chin cleft,, superhero chin, dimple chin, or a chin dimple refer to a dimple on the chin. It is a Y-shaped fissure on the chin with an underlying bony peculiarity. The chin fissure follows the fissure in the lower jaw bone resulted from the incomplete fusion of the left and right halves of the jaw bone, or muscle, during the embryonal and fetal development.
Read “Cleft chin” on English Wikipedia
Read “割れ顎” on Japanese Wikipedia
Read “Cleft chin” on DBpedia

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