The Collaborative International Dictionary of English v.0.48:

Keloid \Ke"loid\, a. [Also spelled cheloid.] [F.
   k['e]lo["i]de, from Gr. chhlh` crab's claw + -oid: cf. F.
   k['e]lo["i]de, ch['e]lo["i]de.] (Med.)
   Applied to a variety of tumor forming hard, flat, irregular
   excrescences upon the skin, or to keloid scar tissue.
   [Webster 1913 Suppl.]

The Collaborative International Dictionary of English v.0.48:

Keloid \Ke"loid\, n. [Also spelled cheloid.]
   1. A keloid tumor.
      [Webster 1913 Suppl.]

   2. An abnormally large scar tissue growing at the site of a
      cut or surgical incision.
      [PJC]

WordNet (r) 3.0 (2006):

cheloid
    n 1: raised pinkish scar tissue at the site of an injury;
         results from excessive tissue repair [syn: keloid,
         cheloid]