Pilonidal sinus
pilonidal sinus n.
A fistula or pit in the sacral region, communicating with the exterior and containing hair that may act as a foreign body and produce chronic inflammation. Also called pilonidal fistula.
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[pahy-lohs] /ˈpaɪ loʊs/ adjective 1. covered with hair, especially soft hair; furry. /ˈpaɪləʊz/ adjective 1. (biology) covered with fine soft hairs: pilose leaves pilose pi·lose (pī’lōs) or pi·lous (-ləs) adj. Covered with fine, soft hair.
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