Having the characteristic of maintaining a relatively constant internal body temperature; warm-blooded.
From Greek 'haima' (blood) + 'thermē' (heat) + '-ous' (full of or characterized by). A variant adjectival form emphasizing the constant temperature feature.
Some animals blur the line—certain fish like tuna and sharks can maintain warm muscles while being cold-blooded overall, giving them sprinting abilities that normal cold-blooded fish can't match!
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