• WordNet 3.6
    • n amphibia the class of vertebrates that live on land but breed in water; frogs; toads; newts; salamanders; caecilians
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Webster's Revised Unabridged Dictionary
    • n. pl Amphibia (Zoöl) One of the classes of vertebrates.☞ The Amphibia are distinguished by having usually no scales, by having eggs and embryos similar to those of fishes, and by undergoing a complete metamorphosis, the young having gills. There are three living orders: (1) The tailless, as the frogs (Anura); (2) The tailed (Urodela), as the salamanders, and the siren group (Sirenoidea), which retain the gills of the young state (hence called Perennibranchiata) through the adult state, among which are the siren, proteus, etc.; (3) The Cœcilians, or serpentlike Amphibia (Ophiomorpha or Gymnophiona), with minute scales and without limbs. The extinct Labyrinthodonts also belonged to this class. The term is sometimes loosely applied to both reptiles and amphibians collectively.
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Century Dictionary and Cyclopedia
    • amphibia In popular language, animals living both on land and in the water; those which voluntarily and habitually enter that element, though not able to breathe under water, such as frogs, turtles, crocodiles, seals, walruses, otters, beavers, hippopotami, etc.
    • amphibia [capitalized] In zoöl., a name variously used. In the Linnean system (1766), the third class of Animalia, including all Reptilia, Batrachia, and various fishes and fish-like vertebrates. It was divided into three orders: reptiles furnished with feet and breathing by the mouth (Testudo, Draco, Lacerta, Rana); footless serpents, also breathing by the mouth (Crotalus, Boa, Coluber, Anguis, Amphisbæna, Cæcilia); finned swimmers (Nantes pinnati), breathing by lateral branchiæ or gills, comprising 14 genera of fishes and fish-like vertebrates, as the Marsipobranchia and Squali.
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Chambers's Twentieth Century Dictionary
    • Amphibia am-fib′i-a animals capable of living both under water and on land
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Webster's Revised Unabridged Dictionary
See Amphibium
Chambers's Twentieth Century Dictionary
L.—Gr., from amphi, both, bios, life.


In literature:

AGLOSSA, a sub-order of anurous amphibia, the frogs, without a tongue.
"The New Gresham Encyclopedia. Vol. 1 Part 1" by Various
Fauna Sueciae Regni, Mammalia, Aves, Amphibia, Pisces, Insecta, Vermes; distributa per classes, ordines, genera et species.
"Lives of Eminent Zoologists, from Aristotle to Linnæus" by William MacGillivray
The Dipnoi show a distinct transition between fishes and amphibia.
"Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 8" by Various
In the Amphibia the glands are sunk into the surface of the kidney.
"Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 8" by Various
Which of the amphibia in this study are fish-like in character?
"A Guide for the Study of Animals" by Worrallo Whitney
In their bones Reptiles and Amphibia have much in common.
"Dragons of the Air" by H. G. Seeley
AMPHIBIA, affinity of, to the ganoid fishes, i.
"The Descent of Man and Selection in Relation to Sex" by Charles Darwin
In the Amphibia the cornea is more convex than in the fish, but the lens is circular and the sclerotic often chondrified.
"Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 1" by Various
In addition to frogs, Germany has few varieties of Amphibia.
"Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 7" by Various
Blue is a structural color, rare among Amphibia, which is achieved by the absence of lipophores above the guanophores.
"Neotropical Hylid Frogs, Genus Smilisca" by William E. Duellman

In poetry:

converse. Linnaeus recoiled from the Amphibia
as a naked gruesome rabble,
Arachnids give me the shudders, but fools
who deface their emblem of guilt
"Thanksgiving for a Habitat" by W H Auden