foxfire

[foks-fahyuhr]
noun Chiefly Midland and Southern U.S.
1.
organic luminescence, especially from certain fungi on decaying wood.
2.
any of various fungi causing luminescence in decaying wood.
Also, fox-fire.


Origin:
1425–75; late Middle English; see fox, fire

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World English Dictionary
foxfire (ˈfɒksˌfaɪə)
 
n
See also bioluminescence a luminescent glow emitted by certain fungi on rotting wood

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
But at night a chemical reaction causes the fungus to emit an eerie green glow sometimes called foxfire.
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