Definition of pilonidal
: of, relating to, or being a hair-containing cyst of the skin in the lower-back region near the upper crease of the buttocks
Origin of pilonidal
Latin pilus hair + nidus nest
First Known Use: 1880
Medical Definition of pilonidal
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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Medical Dictionary: Definition of "pilonidal"
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