furnaces is a form of:

Furnace



noun
1.
(structure in which heat may be constructed, place of intense heat; strictest test) heating furnace ឡសម្រាប់ដុតកម្ដៅផ្ទះ smelting furnace ឡសម្រាប់រំលាយរ៉ែ
ENGLISH MEANING
noun
1.
An inclosed place in which heat is produced by the combustion of fuel, as for reducing ores or melting metals, for warming a house, for baking pottery, etc.; as, an iron furnace; a hot-air furnace; a glass furnace; a boiler furnace, etc.
2.
A place or time of punishment, affiction, or great trial; severe experience or discipline.
verb
1.
To throw out, or exhale, as from a furnace; also, to put into a furnace.