Etymology
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piles (n.)

"hemorrhoids," early 15c., from Medieval Latin pili "piles," which is of uncertain origin, perhaps from Latin pila "ball" (see pill (n.)) and so called from shape.

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Definitions of piles

piles (n.)
venous swelling external or internal to the anal sphincter;
Synonyms: hemorrhoid / haemorrhoid
piles (n.)
a large number or amount;
Synonyms: tons / dozens / heaps / lots / scores / stacks / loads / rafts / slews / wads / oodles / gobs / scads / lashings
From wordnet.princeton.edu