The Collaborative International Dictionary of English v.0.48:

Scar \Scar\, v. i.
   To form a scar.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Scar \Scar\, n. [Scot. scar, scaur, Icel. sker a skerry, an
   isolated rock in the sea; akin to Dan. skiaer, Sw. sk[aum]r.
   Cf. Skerry.]
   An isolated or protruding rock; a steep, rocky eminence; a
   bare place on the side of a mountain or steep bank of earth.
   [Written also scaur.]
   [1913 Webster]

         O sweet and far, from cliff and scar,
         The horns of Elfland faintly blowing.    --Tennyson.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Scar \Scar\, n. [L. scarus, a kind of fish, Gr. ska`ros.]
   (Zool.)
   A marine food fish, the scarus, or parrot fish.
   [1913 Webster] Scarab

The Collaborative International Dictionary of English v.0.48:

Scar \Scar\, n. [OF. escare, F. eschare an eschar, a dry slough
   (cf. It. & Sp. escara), L. eschara, fr. Gr. ? hearth,
   fireplace, scab, eschar. Cf. Eschar.]
   1. A mark in the skin or flesh of an animal, made by a wound
      or ulcer, and remaining after the wound or ulcer is
      healed; a cicatrix; a mark left by a previous injury; a
      blemish; a disfigurement.
      [1913 Webster]

            This earth had the beauty of youth, . . . and not a
            wrinkle, scar, or fracture on all its body. --T.
                                                  Burnet.
      [1913 Webster]

   2. (Bot.) A mark left upon a stem or branch by the fall of a
      leaf, leaflet, or frond, or upon a seed by the separation
      of its support. See Illust. under Axillary.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Scar \Scar\, v. t. [imp. & p. p. Scarred; p. pr. & vb. n.
   Scarring.]
   To mark with a scar or scars.
   [1913 Webster]

         Yet I'll not shed her blood;
         Nor scar that whiter skin of hers than snow. --Shak.
   [1913 Webster]

         His cheeks were deeply scarred.          --Macaulay.
   [1913 Webster]

WordNet (r) 3.0 (2006):

scar
    n 1: a mark left (usually on the skin) by the healing of injured
         tissue [syn: scar, cicatrix, cicatrice]
    2: an indication of damage [syn: scratch, scrape, scar,
       mark]
    v 1: mark with a scar; "The skin disease scarred his face
         permanently" [syn: scar, mark, pock, pit]

Moby Thesaurus II by Grady Ward, 1.0:

158 Moby Thesaurus words for "scar":
   birthmark, blackhead, blaze, blaze a trail, bleb, blemish, blister,
   blotch, bluff, brand, bulla, burn, caste mark, chalk, chalk up,
   check, check off, checkmark, cicatrix, cicatrize, cliff, comedo,
   crack, crag, crater, craze, cut, damage, dapple, dash, deface,
   defacement, defect, define, deform, deformation, deformity,
   delimit, demarcate, dent, discolor, discoloration, disfiguration,
   disfigure, disfigurement, distort, distortion, dot, earmark,
   engrave, engraving, escarpment, face, fault, flaw, fleck, flick,
   freckle, gash, graving, hack, hatch, hemangioma, hickey, impress,
   imprint, injure, injury, jot, keloid, kink, lentigo, line, macula,
   make a mark, mar, mark, mark off, mark out, marking, milium, mole,
   mottle, needle scar, nevus, nick, notch, palisade, palisades,
   patch, pencil, pepper, pimple, pit, pock, pockmark, point,
   polka dot, port-wine mark, port-wine stain, precipice, prick,
   print, punch, punctuate, puncture, pustule, riddle, rift, scab,
   scarification, scarify, scarp, score, scotch, scratch, scratching,
   seal, seam, sebaceous cyst, speck, speckle, splash, split, splotch,
   spot, stain, stamp, steep, stigma, stigmatize, strawberry mark,
   streak, striate, stripe, sty, tattoo, tattoo mark, tick, tick off,
   tittle, trace, track, twist, underline, underscore, verruca,
   vesicle, wale, wall, warp, wart, watermark, weal, welt, wen,
   whitehead, wound