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Medical Definition of Micrognathia
1. Abnormal smallness of the jaws, especially of the mandible. Origin: micro-+ G. Gnathos, jaw Micrognathia with peromelia, hypoplasia of the mandible with malformed and missing teeth, birdlike face, and severe deformities of the hands and forearms and sometimes of feet and legs. Synonym: Hanhart's syndrome. (05 Mar 2000)