Endotherm

Part of speech: noun

Definitions

1. A type of organism that regulates its body temperature internally, remains warm-blooded, and is typically capable of constant metabolic activity
2. This classification of creatures maintains a stable internal heat level through metabolic processes, allowing them to thrive in varying environmental conditions
3. An animal that generates its own heat internally to regulate body temperature, contrasting with those that depend on external warmth for survival

Etymology: "Endotherm" is a plain technical compound: "endo-" from Greek "endon," meaning "within," joined to "-therm" from Greek "thermē," meaning "heat." Together they describe an animal that generates its heat from inside its own body rather than relying mainly on the surroundings to warm it. The contrast with the ectotherm, whose name uses "ecto-" meaning "outside," makes the pairing clear: one warms itself internally, the other depends on external sources such as sunlight. The word belongs to the same family of scientific coinages built from Greek roots, so its parts carry their meanings directly into the term.

Synonyms: warm-blooded, homeotherm, INVALID

Antonyms: cold-blooded, ectotherm, poikilotherm