Amphibia

Part of speech: noun

Definitions

1. A biological class comprising cold-blooded vertebrates that go through metamorphosis, inhabiting aquatic environments in youth and terrestrial habitats as adults
2. A taxonomic classification of vertebrates that experience significant physiological transformation, residing in water during early development and transitioning to land in maturity
3. A diverse group of cold-blooded vertebrates characterized by their life cycle that includes aquatic juvenile stages and terrestrial adult forms

Etymology: "Amphibia" comes from the Greek "amphibia," a neuter plural of "amphibios," meaning "living a double life" or "leading a double life." The Greek word combines "amphi," meaning "both" or "on both sides," with "bios," meaning "life." The idea was that these animals split their existence between water and land, so the name describes a biography spread across two worlds rather than any single habitat. The term was taken into Latin as "amphibia," and English borrowed it from that Latin form. Its use as a formal name for a class of animals was a scientific choice, made because the group's members can live in both water and air. Carl Linnaeus, the Swedish naturalist, used the name in his classification of living things, and it has remained the standard label for the group ever since.

Synonyms: amphibians