Hypocaust

noun

noun ·Rare ·Advanced level

Definitions

Noun
  1. 1
    An underfloor space or flue through which heat from a furnace passes to heat the floor of a room or a bath.
  2. 2
    An underfloor heating system, even without such an underfloor space or flue, as adapted for modern housing.

Synonyms

All synonyms
floorfloor heatinghippocausthippocaustunderfloor heating

Etymology

From Latin hypocaustum, from Ancient Greek ὑπόκαυστον (hupókauston), from Ancient Greek ὑπό (hupó, “underneath”) + καυστόν (kaustón, “burnt offering”).

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