"foxfire : (mycology, chiefly US) Bioluminescence created by some types of fungus, particularly those..."

“foxfire : (mycology, chiefly US) Bioluminescence created by some types of fungus, particularly those growing on rotting wood.
(by extension, loosely) Wood exhibiting fungal bioluminescence; torchwood.
Today is the International Day for Biological Diversity or World Biodiversity Day, which is recognized by the United Nations to promote awareness of the importance of biodiversity.”

- https://en.wiktionary.org/wiki/foxfire#English

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