Definition of fungus
: any of a kingdom (Fungi) of saprophytic and parasitic spore-producing eukaryotic typically filamentous organisms formerly classified as plants that lack chlorophyll and include molds, rusts, mildews, smuts, mushrooms, and yeasts
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Merriam-Webster unabridged
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Time Traveler for fungus
The first known use of fungus was in 1527
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