From Oxford dictionary:
From Wikipedia:dungeon
• noun a strong underground prison cell, especially in a castle.
— ORIGIN Old French, probably originally with the sense ‘lord’s tower’, from Latin dominus ‘lord’.
So what has this got to do with "dung"?In its original medieval usage, donjon meant a keep, the main tower of a castle which formed the final defensive position to which the garrison could retreat when outer fortifications were overcome. The word dungeon is based on Old French donjon, which is derived from Latin dom(i)niōn- "property" (and ultimately dominus "lord"). By association of a tower with a prison, its English meaning has evolved over time to mean an underground prison or oubliette, typically in a basement of a castle.
EDIT:
Found something on here:
It is also possible that dungeon goes back to a Germanic word related to our word dung. This assumed Germanic word would have meant "an underground house constructed of dung." If this etymology is correct, the word dungeon has ended up where it began.
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