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amphibian any cold-blooded vertebrate, such as a frog or salamander, that has aquatic gill-breathing larvae and terrestrial lung-breathing adults. [2/4 definitions]
fish any of various cold-blooded vertebrates that live in water, have gills, fins, and a tail, and move by swimming. [1/7 definitions]
poikilothermal having a body temperature that varies with the environment; cold-blooded.
reptile any of the class of vertebrate cold-blooded animals, including lizards, turtles, snakes, crocodiles, and the like, that breathe with lungs, are covered with scales or hard plates, and have short legs or none at all. [1/4 definitions]