Etymology
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fungus (n.)
1520s, "a mushroom," from Latin fungus "a mushroom, fungus;" used in English at first as a learned alternative to mushroom (funge was used in this sense late 14c.). The Latin word is believed to be cognate with (or derived from) Greek sphongos, the Attic form of spongos "sponge" (see sponge (n.)). "Probably a loanword from a non-IE language, borrowed independently into Greek, Latin and Armenian in a form *sphong- ...." [de Vaan]
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fungiform (adj.)
"mushroom-shaped," 1801, from stem of fungus + -form.
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fungivorous (adj.)
1826, from stem of fungus + -vorous "eating, devouring."
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fungicide (n.)
1889; see fungus + -cide "killing; killer." Related: Fungicidal.
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fungi (n.)
Latin plural of fungus. In biology, in reference to one of the lowest of the great groups of cellular cryptograms.
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fungal (adj.)
1835, from Modern Latin fungalis, from fungus (see fungus). As a noun, "a fungus" (1845). Earlier adjective was fungic 1804.
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fungous (adj.)
mid-15c., "spongy, tender," from Latin fungosus "full of holes, spongy," from fungus "a mushroom, fungus" (see fungus). Meaning "pertaining to or characterized by fungus" is from 18c.; figuratively, often "springing up suddenly" (1751).
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myco- 

before vowels myc-, word-forming element meaning "mushroom, fungus," formed irregularly from Latinized form of Greek mykēs "fungus, mushroom, anything shaped like a mushroom," a word of uncertain origin (Beekes doubts the traditional explanation that connects it to the source of mucus). The correct form is myceto- (mycet-).

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stinkhorn (n.)
type of foul-smelling fungus, 1724, from stink + horn (n.), for its shape.
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ergot (n.)
fungal disease of rye and other grasses, 1680s, from French ergot "ergot," also "a spur, the extremity of a dead branch," from Old French argot "cock's spur" (12c.), which is of unknown origin. The blight so called from the shape the fungus forms on the diseased grain. Related: Ergotic. An alkaloid from the fungus, ergotamine (1921) is used to treat migraines.
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