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Ancient Greek ἀ- ‎(a-, without) + γνάθος ‎(gnáthos, jaw) + -ia.


  • enPR: ăg-nāʹthi-ə, IPA(key): /æɡˈneɪ.θi.ə/


agnathia ‎(uncountable)

  1. (pathology) A birth defect in which the mandible is missing.
    • 1831, William West, translation of Gabriel Andral, A Treatise on Pathological Anatomy, Hodges and Smith, volume 2, page 283:
      When there is agnathia, instead of the inferior maxillary bone we find nothing but a kind of tubercle formed of skin, cellular tissue, fat, and some few muscular fibres.
    • 1907, Francis Delafield and T. Mitchell Prudden, A Text-Book of Pathology, eighth edition, William Wood, page 304
      The lower jaw may be absent (agnathia).
    • 2006, Mark I. Evans et al., Prenatal Diagnosis, McGraw-Hill, ISBN 0-8385-7682-6, page 240:
      As such, it is often accompanied by agnathia, a congenital absence of the mandible[…].

Related terms[edit]



  • agnathia in The Century Dictionary, The Century Co., New York, 1911