Definition of "amphibian" []

• A cold-blooded, smooth-skinned vertebrate of the class Amphibia, such as a frog or salamander, that characteristically hatches as an aquatic larva with gills. The larva then transforms into an adult having air-breathing lungs. (noun)
• An animal capable of living both on land and in water. (noun)
• An aircraft that can take off and land on either land or water. (noun)
• A tracked or wheeled vehicle that can operate both on land and in water. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "The word amphibian comes from the Greek amphibios meaning "both lives"."
• ""As you erudite people well know, the word amphibian comes from the Greek amphi and bios, meaning to live a double life."
• "Moore says what's unique about this Australian amphibian is its way of breeding."