The Collaborative International Dictionary of English v.0.48:

Cutter \Cut"ter\ (k[u^]t"t[~e]r), n.
   1. One who cuts; as, a stone cutter; a die cutter; esp., one
      who cuts out garments.
      [1913 Webster]

   2. That which cuts; a machine or part of a machine, or a tool
      or instrument used for cutting, as that part of a mower
      which severs the stalk, or as a paper cutter.
      [1913 Webster]

   3. A fore tooth; an incisor. --Ray.
      [1913 Webster]

   4. (Naut.)
      (a) A boat used by ships of war.
      (b) A fast sailing vessel with one mast, rigged in most
          essentials like a sloop. A cutter is narrower and
          deeper than a sloop of the same length, and depends
          for stability on a deep keel, often heavily weighted
          with lead.
      (c) In the United States, a sailing vessel with one mast
          and a bowsprit, setting one or two headsails. In Great
          Britain and Europe, a cutter sets two headsails, with
          or without a bowsprit.
      (d) A small armed vessel, usually a steamer, in the
          revenue marine service; -- also called revenue
          cutter.
          [1913 Webster +RDH]

   5. A small, light one-horse sleigh.
      [1913 Webster]

   6. An officer in the exchequer who notes by cutting on the
      tallies the sums paid.
      [1913 Webster]

   7. A ruffian; a bravo; a destroyer. [Obs.]
      [1913 Webster]

   8. A kind of soft yellow brick, used for facework; -- so
      called from the facility with which it can be cut.
      [1913 Webster]

   Cutter bar. (Mach.)
      (a) A bar which carries a cutter or cutting tool, as in a
          boring machine.
      (b) The bar to which the triangular knives of a harvester
          are attached.

   Cutter head (Mach.), a rotating head, which itself forms a
      cutter, or a rotating stock to which cutters may be
      attached, as in a planing or matching machine. --Knight.
      [1913 Webster]

WordNet (r) 3.0 (2006):

cutter
    n 1: someone who cuts or carves stone [syn: stonecutter,
         cutter]
    2: someone who carves the meat [syn: cutter, carver]
    3: someone whose work is cutting (as e.g. cutting cloth for
       garments)
    4: a boat for communication between ship and shore [syn:
       tender, ship's boat, pinnace, cutter]
    5: a sailing vessel with a single mast set further back than the
       mast of a sloop
    6: a cutting implement; a tool for cutting [syn: cutter,
       cutlery, cutting tool]

Moby Thesaurus II by Grady Ward, 1.0:

66 Moby Thesaurus words for "cutter":
   abridger, abstracter, analyzer, ax, baby tooth, bicuspid, blade,
   breaker, bucktooth, canine, centrifuge, cold steel, crown, cuspid,
   cutlery, dagger, deciduous tooth, dent, denticle, denticulation,
   dentil, dentition, dogtooth, edge tools, epitomist, epitomizer,
   eyetooth, fang, finisher, fore tooth, gagtooth, gang tooth,
   garmentmaker, garmentworker, gold tooth, grinder, incisor, knife,
   milk tooth, molar, naked steel, needleworker, peg, permanent tooth,
   pigsticker, pivot tooth, point, premolar, puncturer, scrivello,
   separator, sharpener, shortener, sieve, snag, snaggletooth, steel,
   stitcher, stripper, sword, toad sticker, tooth, tush, tusk,
   whittle, wisdom tooth