brachygnathia

(brak′ig-nā′thē-ə)
n
bird-face, micrognathia

Marked underdevelopment of the mandible. adj brachygnathous. See also retrognathism.

(brăk'ĭg-nā'thē-ə)
n.

Abnormal shortness or recession of the mandible. Also called bird face.

Abnormal shortness of the mandible resulting in a maxilla that is longer. Called also overshot, parrot mouth.