pilonidal

As a noun taxonomy

is the science or the technique used to make a classification.

As an adjective pilonidal is

having body hairs which have grown in a concentrated area on the skin and formed a cyst or abscess.

As adjectives the difference between pilonidal and perineal

is that pilonidal is having body hairs which have grown in a concentrated area on the skin and formed a cyst or abscess while perineal is referring to the region of the perineum.

As a noun abscess

is a cavity caused by tissue destruction, usually because of infection, filled with pus and surrounded by inflamed tissue .

As a verb abscess

is to form a pus filled cavity typically from an infection.

As an adjective pilonidal is

having body hairs which have grown in a concentrated area on the skin and formed a cyst or abscess.

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.