Shaped like a mushroom or fungus; having a rounded top on a narrow stem.
From Latin fungus + -form (shaped like), a direct descriptive term for mushroom-shaped structures. It appeared in anatomical and botanical texts from the 16th century onward to describe fungus-like morphology.
Your tongue has fungiform papillae—the mushroom-shaped bumps that contain your taste buds—and they're named because 16th-century anatomists thought they looked exactly like tiny toadstools.
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