agnathia

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, page 240:

     As such, it is often accompanied by agnathia, a congenital absence of the mandible[…].

• agnath
• agnatha
• agnathan
• agnathous

• “agnathia”, in The Century Dictionary […], New York, N.Y.: The Century Co., 1911, →OCLC.