different between agnath vs agnathia

English

Etymology

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

Pronunciation

• enPR: ?g?n?th, IPA^(key): /?æ?.n??/

Noun

agnath (plural agnaths)

1. (zoology) An agnathan.
   • 1979, Stephen C. Wood, Evolution of Respiratory Processes, Marcel Dekker, ?ISBN, page 218:

     Evolution of vertebrates was accompanied by a gradual increase in oxygen availability, from the irrespirable atmosphere of the Precambrian to a PO? at 7 mmHg with the first vertebrates (agnaths), to the present sea level PO? value of 160 mmHg with the first reptiles.

   • 1996, George Christopher Williams, Adaptation and Natural Selection, Princeton University Press, ?ISBN, page 51:

     The gnathostomes almost entirely replaced the agnaths, presumably because they were more effective fishes.

   • 2002, Harold J. Morowitz, The Emergence of Everything, Oxford University Press, ?ISBN, page 113:

     Thus, although tunicates are presumably intermediate between flatworms and agnaths, the larval tunicate more closely resembles the flatworm and adult agnath.

Anagrams

• ghanta

German

Etymology

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

Adjective

agnath (not comparable)

1. (zoology) jawless
   • 1895, H. Henking, “Ueber die Ernährung von Glandina algira L.”, Zoologische Jahrbücher, volume 8, page 87:

     Da die Testacelliden agnath sind, so vermögen sie sich ihrer Beute nur mit Hülfe der Radula zu bemächtigen, indem diese etwas vorgestülpt wird, um ein Eingreifen der Radula-Zähne zu ermöglichen.

   • 1906, “Pisces für 1902”, Archiv für Naturgeschichte, volume 2, issue 1, page 15

     Erörterung der Frage, ob die Ostracodermen agnath oder gnathostom sind.

   • 2004, Rüdiger Wehner and Walter Gehring, Zoologie, twenty-fourth edition, Thieme, ?ISBN, page 809:

     Hypothetisches Ausgangsstadium (agnathes Wirbeltier) mit gleichförmigen Branchialbögen (Kieferbögen).

Declension

Synonyms

• kieferlos

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.