warm-blooded

adjective

warm-blood·​ed ˈwȯrm-ˈblə-dəd 

1

: having warm blood

specifically : having a relatively high and constant internally regulated body temperature relatively independent of the surroundings

2

: fervent or ardent in spirit

warm-bloodedness noun

Synonyms of warm-blooded

• warm
• passionate
• passional
• fervent
• emotional

Examples of warm-blooded in a Sentence

a warm-blooded defense of everyone's right to free speech

Recent Examples on the Web

Coliform bacteria is an intestinal bacteria found in warm-blooded mammals that can grow from fecal bacteria and cause illness in people, according to the Environmental Protection Agency. —Caelyn Pender, Mercury News, 30 Apr. 2026

The research suggests that warm-blooded fish species, which include great whites, shortfin makos and salmon sharks, burn about four times more energy than cold-blooded species and will increasingly be forced into cooler regions with less food. —Moná Thomas, PEOPLE, 24 Apr. 2026

Some of the ocean’s most powerful predators are warm-blooded creatures that burn nearly four times more energy than their cold-blooded counterparts. —Maria Mocerino, Interesting Engineering, 19 Apr. 2026

Although most fish species are cold-blooded, one especially contrarian species, the opah (Lampris guttatus), is warm-blooded. —Encyclopedia Britannica, 2 Apr. 2026

Word History

First Known Use

1793, in the meaning defined at sense 1

Rhymes for warm-blooded

• blooded
• budded
• flooded
• studded
• thudded

Kids Definition

warm-blooded

adjective

warm-blood·​ed

ˈwȯrm-ˈbləd-əd

1

: able to keep up a relatively high and constant body temperature that is mostly independent of that of the surrounding environment

birds and mammals are warm-blooded

2

: warm in feeling

warm-bloodedness noun

Medical Definition

warm-blooded

adjective

warm-blood·​ed ˈwȯrm-ˈbləd-əd 

: having warm blood

specifically : having a relatively high and constant body temperature relatively independent of the surroundings

warm-bloodedness noun