The Collaborative International Dictionary of English v.0.48:

Blacksmith \Black"smith`\, n. [Black (in allusion to the color
   of the metal) + smith. Cf. Whitesmith.]
   1. A smith who works in iron with a forge, and makes iron
      utensils, horseshoes, etc.
      [1913 Webster]

            The blacksmith may forge what he pleases. --Howell.
      [1913 Webster]

   2. (Zool.) A fish of the Pacific coast (Chromis
      punctipinnis, or Heliastes punctipinnis), of a blackish
      color.
      [1913 Webster] Black snake

WordNet (r) 3.0 (2006):

blacksmith
    n 1: a smith who forges and shapes iron with a hammer and anvil