A small pad-like or lobe-like structure on the feet of certain insects, used for gripping and adhesion.
From Latin 'arolium,' a zoological term of uncertain origin, possibly related to Romance roots. The term entered scientific English through zoological taxonomy in the 18th-19th centuries.
The arolium is why flies can taste with their feet—they land on food, and the arolium's adhesive pads pick up chemical compounds, sending signals to their nervous system, which is why a fly's 'taste buds' cover its entire landing gear.
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