The Collaborative International Dictionary of English v.0.48:

Scutcheon \Scutch"eon\, n. [Aphetic form of escutcheon.]
   1. An escutcheon; an emblazoned shield. --Bacon.
      [1913 Webster]

            The corpse lay in state, with all the pomp of
            scutcheons, wax lights, black hangings, and mutes.
                                                  --Macaulay.
      [1913 Webster]

   2. A small plate of metal, as the shield around a keyhole.
      See Escutcheon, 4.
      [1913 Webster]

WordNet (r) 3.0 (2006):

scutcheon
    n 1: a flat protective covering (on a door or wall etc) to
         prevent soiling by dirty fingers [syn: finger plate,
         escutcheon, scutcheon]
    2: a shield; especially one displaying a coat of arms [syn:
       escutcheon, scutcheon]

Moby Thesaurus II by Grady Ward, 1.0:

102 Moby Thesaurus words for "scutcheon":
   achievement, alerion, animal charge, annulet, argent,
   armorial bearings, armory, arms, azure, bandeau, bar, bar sinister,
   baton, bearings, bend, bend sinister, billet, blazon, blazonry,
   bordure, broad arrow, cadency mark, canton, chaplet, charge,
   chevron, chief, coat of arms, cockatrice, coronet, crescent, crest,
   cross, cross moline, crown, device, difference, differencing,
   eagle, ermine, ermines, erminites, erminois, escutcheon, falcon,
   fess, fess point, field, file, flanch, fleur-de-lis, fret, fur,
   fusil, garland, griffin, gules, gyron, hatchment, helmet,
   heraldic device, honor point, impalement, impaling, inescutcheon,
   label, lion, lozenge, mantling, marshaling, martlet, mascle, metal,
   motto, mullet, nombril point, octofoil, or, ordinary, orle, pale,
   paly, pean, pheon, purpure, quarter, quartering, rose, sable,
   saltire, shield, spread eagle, subordinary, tenne, tincture, torse,
   tressure, unicorn, vair, vert, wreath, yale