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Definition of the noun agnathan

What does agnathan mean as a name of something?

noun - plural: -

  1. eel-shaped vertebrate without jaws or paired appendages including the cyclostomes and some extinct forms
    • lexical domain: Animals - nouns denoting animals
    • synonyms of agnathan: jawless fish / jawless vertebrate
    • more generic term: aquatic vertebrate = animal living wholly or chiefly in or on water
    • more specific terms:
      • ostracoderm = extinct fish-like jawless vertebrate having a heavily armored body
      • heterostracan = extinct jawless fish with the anterior part of the body covered with bony plates
      • osteostracan / cephalaspid = extinct jawless fish of the Devonian with armored head
      • anaspid = extinct small freshwater jawless fish usually having a heterocercal tail and an armored head
      • conodont = small (2 inches long) extinct eellike fish with a finned tail and a notochord and having cone-shaped teeth containing cellular bone; late Cambrian to late Triassic
      • cyclostome = primitive aquatic vertebrate
      • lamprey eel / lamper eel / lamprey = primitive eellike freshwater or anadromous cyclostome having round sucking mouth with a rasping tongue
      • slime eels / hagfish / hag = eellike cyclostome having a tongue with horny teeth in a round mouth surrounded by eight tentacles
    • member of: Agnatha / superclass Agnatha = superclass of eel-shaped chordates lacking jaws and pelvic fins: lampreys; hagfishes

Alternative definition of the noun agnathan


  1. [zoology] A member of the superclass Agnatha of jawless vertebrates.

Definition of the adjective agnathan

What does agnathan mean as an attribute of a noun?


  1. [zoology] Belonging or pertaining to the superclass Agnatha, the jawless vertebrates.

Printed dictionaries and other books with definitions for Agnathan

Click on a title to look inside that book (if available):

Google previewRegional Stratigraphy of North America (2013)

by W.J. Frazier, D.R. Schwimmer

showing that agnathans were very abundant by the Middle Ordovician. The most representative Middle Ordovician agnathan is the heterostracan Astraspis, which reached sizes to 1.5 m .

Google previewFishes of the World (2016)

by Joseph S. Nelson, Terry C. Grande, Mark V. H. Wilson

However, the term agnathan is a useful one that is still often used to refer collectively to these primitive fishes. Similarly, the ostracoderms, formerly used for fossil, armored jawless fishes, are also now agreed to be a paraphyletic assemblage.

Google previewEncyclopedia of Fish Physiology (2011)

From Genome to Environment

Agnathan(s) brains, See Agnathan brain, functional morphology definition, 16, 110, 236 endogenous opioid peptides, proopiomelanocortins, 93t feeding ...

Google previewEncyclopedia of Immunobiology (2016)

Agnathan. Immune. Response. Like the gnathostome adaptive immune system, the dichotomy of humoral and cellular immune functions of the adaptive system is maintained in agnathans; humoral immunity is mediated by VLRBþ cells.

Google previewEncyclopedia of Environment and Society (2007)

FIVE-VOLUME SET by Paul Robbins

Again many trilobites disappeared, along with many agnathan and placoderm species of fish. In the Permian Era, about half of all animal families vanished. These included many of the new species that had not been found in the fossil record ...

Google previewA Dictionary of Science (2010)

by Elizabeth A. Martin

agnathan Anyjawless craniate animal. Agnathans were formerly classified in the subphylum (or superclass) Agnatha, with the living representatives — lampreys and hagfishes — constituting the class Cyclostomata .

Google previewInternational Encyclopedia of Military History (2004)

by James C. Bradford

Fain, Baron Agnathan. Memoirs of the Invasion of France by the Allied Armies. London, 1834. Houssaye ...

Google previewA Dictionary of Geology and Earth Sciences (2013)

by Michael Allaby

(agnathan fish, see AGNATHA). headwall, glacial The steep rock slope at the head of a *cirque or *valley glacier. It is a site of active *erosion, ...

Google previewA Dictionary of Biology (2015)

by Robert Hine

Compare agnathan. Gnetophyta See gymnosperm. gnotobiotic Designating germ -free ...

Google previewA Dictionary of Zoology (2003)

by Michael Allaby

The first protofish are known from late *Cambrian fossils, and the first true fish, an agnathan, has been recorded from earliest *Ordovician sediments. Most modern classifications omit the term 'Pisces', regarding it as artificial. See also ...

Google previewEncyclopedia of Invasive Species: From Africanized Honey Bees to Zebra Mussels [2 volumes] (2011)

From Africanized Honey Bees to Zebra Mussels by Susan L. Woodward, Joyce A. Quinn

Agnathan. Member of the class Agnatha, the jawless fish. Alate. Winged reproductive adult of a social insect, such as ants and termites. Alien (species). A nonnative species. A species found beyond its normal range limits. Synonyms: exotic ...

Google previewEncyclopedia of Marine Science (2009)

by C. Reid Nichols, Robert G. Williams

The Agnathan fossil record ...

Google previewAcademic Press Dictionary of Science and Technology (1992)

by Christopher G. Morris, Academic Press

Thus, agnathan. agnathia [ag nath'e a] Medicine, a developmental anomaly characterized by the absence of the lower jaw. agnathous [ag nath'as] Medicine, relating to or affected with agnathia; lacking a lower jaw. Zoology. 1. lacking jaws.

Google previewMicrosoft Encarta College Dictionary (2001)

The First Dictionary For The Internet Age by Anne H. Soukhanov

agnatic /ag nattik/ adj — agnati-cal-ly adv — agnation /ag naysh'n/ n ag fia than / agnathan/ n a vertebrate aquatic animal that has no jaw, e.g., a lamprey or hagfish. Subphylum: Agnatha. [Mid-20C. < modern Latin Agnatha < Greek a- " without, ...

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Video about Agnathan

Agnathan Meaning

Video shows what agnathan means. Belonging or pertaining to the superclass Agnatha, the jawless vertebrates.. agnathan synonyms: agnath, agnatha.

Quotes about Agnathan

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Scrabble value of A1G2N1A1T1H4A1N1

The value of this 8-letter word is 12 points, but it's not an accepted word in the Official Scrabble Players Dictionary.

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