[fur.nace] n [ME furnas, fr. OF fornaise, fr. L fornac-, fornax; akin to L formus warm--more at therm] (13c): an enclosed structure in which heat is produced (as for heating a house or for reducing ore)
FURNACE
Meaning of FURNACE in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012