- any cold-blooded vertebrate of the class Amphibia, comprising frogs and toads, newts and salamanders, and caecilians, the larvae being typically aquatic, breathing by gills, and the adults being typically semiterrestrial, breathing by lungs and through the moist, glandular skin.
- an amphibious plant.
- an airplane designed for taking off from and landing on both land and water.
- Also called amtrac. a flat-bottomed, armed, military vehicle, equipped with both tracks and a rudder, that can travel either on land or in water, used chiefly for landing assault troops.
- belonging or pertaining to the Amphibia.
- amphibious(def 2).
Origin of amphibian
Examples from the Web for amphibians
Over the next decade, the RETs wreaked havoc on the ecosystem, eating ducklings, small water birds, and other amphibians.How the ‘Teenage Mutant Ninja Turtles’ Inadvertently Caused an Environmental Crisis
August 5, 2014
Some resemble insects, while others look like crustaceans, amphibians, and sharks and move fluidly.Guillermo del Toro’s ‘Pacific Rim’ Is a Total Blast
July 9, 2013
These amphibians are evidently the descendants of some of the fishes of the Devonian times.
This doubtless was true of the amphibians of the coal period.
Do everything in your power to halt the march of Moyen's amphibians!
It is related to the amphibians and was able to live in or out of the water.
We know two--the Nevians, who are amphibians, and the fishes of the greater deeps.Triplanetary
Edward Elmer Smith
- any cold-blooded vertebrate of the class Amphibia, typically living on land but breeding in water. Their aquatic larvae (tadpoles) undergo metamorphosis into the adult form. The class includes the newts and salamanders, frogs and toads, and caecilians
- a type of aircraft able to land and take off from both water and land
- any vehicle able to travel on both water and land
- another word for amphibious
- of, relating to, or belonging to the class Amphibia
Word Origin and History for amphibians
Formerly used by zoologists to describe all sorts of combined natures (including otters and seals), the biological sense "class of animals between fishes and reptiles that live both on land and in water" and the noun derivative both are first recorded 1835. Amphibia was used in this sense from c.1600 and has been a zoological classification since c.1819.
- A cold-blooded, smooth-skinned vertebrate of the class Amphibia. Amphibians hatch as aquatic larvae with gills and, in most species, then undergo metamorphosis into four-legged terrestrial adults with lungs for breathing air. The eggs of amphibians are fertilized externally and lack an amnion. Amphibians evolved from lobe-finned fish during the late Devonian Period and include frogs, toads, newts, salamanders, and caecilians.
Word History: Amphibians, not quite fish and not quite reptiles, were the first vertebrates to live on land. These cold-blooded animals spend their larval stage in water, breathing through their gills. In adulthood they usually live on land, using their lungs to breath air. This double life is also at the root of their name, amphibian, which, like many scientific words, derives from Greek. The Greek prefix amphi- means both, or double, and the Greek word bios means life. Both these elements are widely used in English scientific terminology: bios, for example, is seen in such words as biology, antibiotic, and symbiotic.
Vertebrate animals, such as frogs, that live part of their life cycle in the water and the other part on land.