balano-, balan- +

(Greek: acorn)

By extension, it is used in medicine and refers to the "glans penis" or to the "glans clitoridis".

balaniferous
Bearing or producing acorns.
balanite
1. A fossil balanoid (like an acorn) shell.
2. A fossil shell of the genus Balanus.
balanitis
Inflammation of the rounded head (the glans) of the penis.

Inflammation of the foreskin is called posthitis. In the uncircumcised male, balanitis and posthitis generally occur together as balanoposthitis: inflammation of both the glans and foreskin.

balanoid
Resembling an acorn; applied to a group of barnacles having shells shaped like acorns.
balanoplasty
Plastic surgery of the glans penis.