adj ·Rare ·Advanced level

Definitions

Adjective

1. 1
   Of or relating to an ectotherm; having a body temperature that varies depending on the outside temperature.

Adjective

1. 1
   of animals except birds and mammals; having body temperature that varies with the environment wordnet

Synonyms

All synonyms

cold bloodedcold-bloodedectothermalexothermicheterothermicpoikilotherm

Antonyms

All antonyms

warm bloodedendothermichomeothermichomothermic

Etymology

From ectotherm + -ic.

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.