pilonidal

pi·lo·ni·dal

adj \ˌpī-lə-ˈnīd-^əl\

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