Shaped like a small fungus or having characteristics of a slender, fungus-like form.
From Latin fungus + -illus (diminutive, making it small) + -form (shaped), creating 'shaped like a small fungus.' This specialized anatomical term appeared in medical and biological texts of the 18th century.
Fungilliform is the hyper-specific term biologists use for structures that are mushroom-shaped but delicate and thin—it's the difference between a stout puffball and a spindly ink-cap mushroom.
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