Macrostomia refers to a mouth that is unusually wide. Some cases are treated with surgery. ...
Greatly exaggerated width of the mouth, resulting from failure of union of the maxillary and mandibular processes, with extension of the oral orifice toward the ear. The defect may be unilateral or bilateral. ... (12 Dec 1998) ... 
(mak″ro-sto´me-ә) excessive width of the mouth.
Type: Term Pronunciation: mak′rō-stō′mē-ă Definitions: 1. Abnormally large size of the mouth resulting from failure of fusion between the maxillary and mandibular prominences of the embryonic face.