dermoid cyst

from WordNet (r) 3.0 (2006)

dermoid cyst
    n 1: a cystic tumor (usually benign) with a wall lined with
         epithelium and a cavity containing other material

from The Collaborative International Dictionary of English v.0.48

Dermoid \Der"moid\, a. [Derm + -oid: cf. F. dermo["i]de.]
   Same as {Dermatoid}.
   [1913 Webster]

   {Dermoid cyst} (Med.), a cyst containing skin, or structures
      connected with skin, such as hair.
      [1913 Webster]