hy.po.caust

n.（名詞）
A space under the floor of an ancient Roman building where heat from a furnace was accumulated to heat a room or a bath.
炕：古羅馬建筑地面以下的空間，在那兒火爐的熱聚集給房子或沐浴供暖

來源：
Latin hypocaustum
拉丁語 hypocaustum
from Greek hupokauston
源自 希臘語 hupokauston
from hupokaiein [to light a fire beneath]
源自 hupokaiein [在…之下燃起一團火]
hupo- [hypo-]
hupo- [前綴，表.低于….的意思]
kaiein [to burn]
kaiein [燃燒]