amphibians

n. cold-blooded vertebrate animal able to live both on land and water

Amphibians (class Amphibia; from Greek αμφις "both" and βιος "life") are a taxon of animals that include all living tetrapods (four-legged vertebrates) that do not have amniotic eggs, are ectothermic (term for the animals whose body heat is regulated by the external environment; previously known as cold-blooded), and generally spend part of their time on land. Most amphibians do not have the adaptations to an entirely terrestrial existence found in most other modern tetrapods (amniotes). There are around 6,000 described, living species of amphibians. The study of amphibians and reptiles is known as herpetology. Amphibians are able to breathe through their skin.
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Noun
1. a flat-bottomed motor vehicle that can travel on land or water
(synonym) amphibious vehicle
(hypernym) motor vehicle, automotive vehicle
(hyponym) swamp buggy, marsh buggy
2. an airplane designed to take off and land on water
(synonym) amphibious aircraft
(hypernym) airplane, aeroplane, plane
(part-meronym) pontoon
3. cold-blooded vertebrate typically living on land but breeding in water; aquatic larvae undergo metamorphosis into adult form
(hypernym) vertebrate, craniate
(hyponym) Hynerpeton bassetti
(member-holonym) Amphibia, class Amphibia
(part-meronym) lateral line, lateral line organ
Adjective
1. relating to or characteristic of animals of the class Amphibia
(synonym) amphibious
(pertainym) Amphibia, class Amphibia

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