tap-hole

taphole

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

Origin:
1585–95; tap2 + hole

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

Collins English Dictionary - Complete & Unabridged 10th Edition
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