# caldarium

> English word · Noun · IPA /kælˈdɛəɹi.əm/

## Definitions
1. In Roman baths, the hottest room, with a plunge-pool. It preceded the tepidarium and frigidarium.
2. In modern spas, a room with a hot floor.
3. An intermediate or warm greenhouse.

## Etymology
Unadapted borrowing from Latin caldārium (“room containing warm water for bathing”), substantive of caldārius (“of, pertaining to or suitable for bathing”), from caldus (“warm, hot”) + -ārius, alternative form of calidus, from caleō (“I am warm or hot; glow”).

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/caldarium