单词	pilonidal
释义	pilonidal adjective pi·​lo·​ni·​dal ˌpī-lə-ˈnī-dᵊl  : of, relating to, or being a hair-containing cyst of the skin in the lower-back region near the upper crease of the buttocks Example Sentences Recent Examples on the Web Isabell suffers from pilonidal disease, a chronic skin infection that causes cysts to form in the crease between the buttocks. USA Today, 25 Feb. 2021 Word History Etymology Latin pilus hair + nidus nest First Known Use 1880, in the meaning defined above Medical Definition pilonidal adjective pi·​lo·​ni·​dal ˌpī-lə-ˈnīd-ᵊl  1 : containing hair nested in a cyst —used of congenitally anomalous cysts in the sacrococcygeal area that often become infected and discharge through a channel near the anus 2 : of, relating to, involving, or for use on pilonidal cysts, tracts, or sinuses
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