[{"Bold_text": "noun", "List Items": ["a structure or apparatus in which heat may be generated, as for heating houses, smelting ores, or producing steam.", "a place characterized by intense heat:The volcano was a seething furnace.", "Furnace,Astronomy.the constellation Fornax."]}, {"Bold_text": "verb (used with object)", "List Items": ["to heat (a metal piece) in a furnace."]}]