dyskeratoma

dys·ker·a·to·ma
n.

A skin tumor characterized by dyskeratosis.

dyskeratosis
n.

Premature keratinization in cells that are not in the keratinizing surface layer of the skin and keratinization of the corneal epithelium.

keratinization
n.

The process of producing a tough, insoluble protein substance that is the chief structural constituent of hair, nails, horns, and hooves.

epithelium
n.

Membranous tissue composed of one or more layers of cells separated by very little intercellular substance and forming the covering of most internal and external surfaces of the body and its organs.

corneal
adj.

Of or related to the cornea.

cornea
n.

The transparent convex anterior portion of the outer fibrous coat of the eyeball that covers the iris and the pupil and is continuous with the sclera.

sclera
n.

The tough white fibrous outer envelope of tissue covering all of the eyeball except the cornea. Also called sclerotic, sclerotic coat.

(dictionary.com)

n.

Anything that takes a shitload of time to figure out what it is even after looking it up in the dictionary.