noun
crucible furnace
Technical term for a furnace that uses a crucible to melt or heat materials, especially in metallurgy and chemistry.
坩堝炉で金属を溶かす。
Melt metal in a crucible furnace.
坩堝 refers to the crucible itself, while 坩堝炉 is the furnace that contains it.
Compound of 坩堝 (るつぼ, 'crucible') + 炉 (ろ, 'furnace'). The exact origin of るつぼ is uncertain, but it may be related to Portuguese 'crisol' or Dutch 'kroes'.