As a noun cyst
is a pouch or sac without opening, usually membranous and containing morbid matter, which develops in one of the natural cavities or in the substance of an organ.
As an adjective pilonidal is
having body hairs which have grown in a concentrated area on the skin and formed a cyst or abscess.
cyst
English
(wikipedia)
Noun
(
en noun)
A pouch or sac without opening, usually membranous and containing morbid matter, which develops in one of the natural cavities or in the substance of an organ.
See also
* enchondroma
----
pilonidal
English
Adjective
(-)
Having body hairs which have grown in a concentrated area on the skin and formed a cyst or abscess.
Derived terms
* pilonidal abscess
* pilonidal cyst
* pilonidal disease
* pilonidal sinus