Source : Webster's Revised Unabridged Dictionary (1913)

Dermoid \Der"moid\, a. [Derm + -oid: cf. F. dermo["i]de.]
   Same as {Dermatoid}.

   {Dermoid cyst} (Med.), a cyst containing skin, or structures
      connected with skin, such as hair.

Source : WordNet®

dermoid cyst
     n : a cystic tumor (usually benign) with an epithelium-lined
         wall and a cavity containing other material