A furnace or oven, especially one used for intense heating; also a faint constellation in the southern sky.
From Latin 'fornax' meaning furnace or kiln. Romans used this term for baking ovens and heat sources. In the 18th century, it was adopted as the name for a constellation observed in the southern hemisphere.
Fornax is a constellation so faint that astronomers literally named it after a furnace—not because it's super hot, but because it was one of the few dim regions of sky they still needed to name!
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