<p><strong>Noun</strong></p><ul><li>a structure or apparatus in which heat may be generated, as for heating houses, smelting ores, or producing steam.</li><li>a place characterized by intense heat: The volcano was a seething furnace.</li><li>Furnace, Astronomy: the constellation Fornax.</li></ul><p><strong>Verb</strong></p><ul><li>(used with object) fur·naced, fur·nac·ing: to heat (a metal piece) in a furnace.</li></ul>