different between agnathia vs agnathous

English

Etymology

Ancient Greek ?- (a-, “without”) + ?????? (gnáthos, “jaw”) +? -ia.

Pronunciation

• enPR: ?g-n??thi-?, IPA^(key): /æ??ne?.?i.?/

Noun

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[…].

Related terms

• agnath
• agnatha
• agnathan
• agnathous

Translations

References

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

English

Etymology

Ancient Greek ?- (a-, “without”) + ?????? (gnáthos, “jaw”) +? -ous.From a- +? -gnathous

Pronunciation

• enPR: ?g?n?.th?s, IPA^(key): /?æ?.n?.??s/

Adjective

agnathous (not comparable)

1. Jawless.
   • 1876, William G. Binney, “On the Lingual Dentition, Jaw, and Genitalia of Carelia, Onchidella, and Other Pulmonata”, Proceedings of the Academy of Natural Sciences of Philadelphia, page 185:

     The Onchidiidæ are described as agnathous, but I am confident of having observed the jaw figured.

   • 1900, Ramsay Heatley Traquair, “Notes on Drepanaspis Gmündenensis, Schlüter”, Geological Magazine, page 158:

     The mouth is a transverse slit, which shows no teeth, nor any jaws properly so called, and therefore affords an apparent support to the agnathous theory of the Ostracodermi.

   • 1997, Gene S. Helfman, The Diversity of Fishes, Blackwell Science, ?ISBN, page 152:

     This and related agnathous (jawless), finless forms inhabited shallow seas or estuarine habitats[…].

   • 2007, James Brown, “Sequencing the Braden Style within Mississippian Period Art and Iconography”, Ancient Objects and Sacred Realms, University of Texas Press, ?ISBN, page 235:

     Parenthetically, this line treatment suggests an attempt to mimic the agnathous (jawless) head, if we suppose that the jaw area was colored suitably dark in contrast to the face proper.

2. (pathology) Afflicted by or characteristic of agnathia.
   • 1964, M. W. Fox, “Anatomy of the Canine Skull in Low-grade Otocephaly”, Canadian Journal of Comparative Medicine and Veterinary Science, volume 28, pages 105–106:

     In all the neonates examined from the partially agnathous strain, there was no obvious agenesia of the lower mandible.

Synonyms

• (jawless): agnathic, jawless
• (afflicted by agnathia): agnathic

Related terms

• agnath
• agnatha
• agnathan

Translations

References

• agnathous in Oxford English Dictionary, volume I, 1888