- noun a large brick or metal oven which can be heated to a very high temperature
- noun a heater which warms the water for central heating
- noun a container for burning fuel and ore
- That part of a boiler or warm-air heating plant in which combustion takes place.
- A complete heating unit that transfers heat from burning fuel to a heating system.
Origin & History of “furnace”
Etymologically, furnace means roughly ‘warm place’. It comes via Old French fornais from Latin fornāx ‘furnace’. this was a derivative of fornus ‘oven’, a word related to formus ‘warm’, which goes back to the same Indo-European source, *ghworm-, *ghwerm-, as probably produced English warm.