Congenital Abnormality
macrostomia
mac·ro·sto·mi·a
Subclass of:
Mouth Abnormalities
Etymology:
Greek makros = big + stoma = mouth
Definitions related to macrostomia:
  • (wide mouth) Distance between the oral commissures more than 2 SD above the mean. Alternatively, an apparently increased width of the oral aperture (subjective).
    Human Phenotype Ontology (HPO)
    The Human Phenotype Ontology Project, 2025
  • 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. (Dorland, 27th ed)
    NLM Medical Subject Headings
    U.S. National Library of Medicine, 2025
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