noun Metallurgy.
a hole in a blast furnace, steelmaking furnace, etc., through which molten metal or slag is tapped off.

1585–95; tap2 + hole

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World English Dictionary
taphole (ˈtæpˌhəʊl)
a hole in a furnace for running off molten metal or slag

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The fluid ash falls through a taphole at the bottom of the first stage into a water quench, forming an inert vitreous slag.
One taphole is always open and the hot metal is removed continuously.
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