Source : Webster's Revised Unabridged Dictionary (1913)

Excrescence \Ex*cres"cence\n. [F. excrescence, excroissanse, L.
   excrescentia excrescences, neut. pl. of p. pr. of excrescere.
   See {Excrescent}.]
   An excrescent appendage, as, a wart or tumor; anything
   growing out unnaturally from anything else; a preternatural
   or morbid development; hence, a troublesome superfluity; an
   incumbrance; as, an excrescence on the body, or on a plant.
   ``Excrescences of joy.'' --Jer. Taylor.

         The excrescences of the Spanish monarchy. --Addison.

Source : WordNet®

excrescence
     n 1: something that bulges out or is protuberant or projects from
          a form [syn: {bulge}, {bump}, {hump}, {gibbosity}, {gibbousness},
           {jut}, {prominence}, {protuberance}, {protrusion}, {extrusion}]
     2: (pathology) an abnormal outgrowth or enlargement of some
        part of the body