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.
pilonidal fistula
Words nearby pilonidal sinus
pilomatrixoma,
pilomotor,
pilomotor reflex,
pilon,
pilonidal,
pilonidal sinus,
pilos,
pilose,
pilosebaceous,
pilot,
pilot balloon