Also found in: Thesaurus, Medical, Legal, Encyclopedia, Wikipedia.


An organism that depends on external sources for its body heat.


an animal whose body temperature is determined by ambient temperature, and hence any animal except birds and mammals


(ˈɛk təˌθɜrm)

a cold-blooded animal.
ec`to•ther′mic, adj.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.ectotherm - an animal whose body temperature varies with the temperature of its surroundings; any animal except birds and mammals
animal, animate being, beast, creature, fauna, brute - a living organism characterized by voluntary movement
References in periodicals archive ?
In order to simulate the temporal dynamics of individual stocks and food web within the marine ecosystem off central-south Chile, a bioenergetics consumer-resource model of species biomass over time was developed, based on the model of Yodzis & Innes (1992), where a consumer-resource system with two species, one of which eats members of the other, and where most of the parameters were determined by the body sizes and metabolic categories (endotherm, vertebrate ectotherm, invertebrate ectotherm, or plant) of the populations in question.
Why "suboptimal" is optimal: Jensen's inequality and ectotherm thermal preferences.
Terrestrial systems act as a test for the role of endothermy in limiting food chain lengths, as endotherm and ectotherm consumers are often more similar in size in those systems (partially controlling for body size as a variable).
Members of the genus Candida, particularly C albicans, are commensal dimorphic fungi that inhabit the skin as well as the upper-respiratory, alimentary, and genital tracts of humans and ectotherm animals, including birds.
1998), due to ectotherm behavior, the digestion in Testudines is influenced by environmental temperature, as reported by Meyer (1998), for Testudo hermanni, stating that the residence time of the contrast in the gastrointestinal tract was relatively short, and were not observed, satisfactorily, details of intestinal mucosa.
Other topics covered include the role of protein biosysnthesis in synaptic plasticity, secreted protein and peptide biosynthesis, and the effects of temperature on ectotherm protein metabolism.
Many studies of ectotherm thermoregulation have used cost-benefit concepts to interpret patterns of body-temperature ([T.
Mike Demlong, formerly the Ectotherm Curator at the Phoenix Zoo, is now the Amphibians and Reptiles Program Manager for the Arizona Game and Fish Department.
2008) mentioned that WT represents the average of environmental warming an ectotherm can tolerate before performance drop to a fatal level.