The Collaborative International Dictionary of English v.0.48:

Razor \Ra"zor\ (r[=a]"z[~e]r), n. [OE. rasour, OF. rasur, LL.
   rasor: cf. F. rasoir, LL. rasorium. See Raze, v. t.,
   Rase, v. t.]
   1. A keen-edged knife of peculiar shape, used in shaving the
      hair from the face or the head; also called a straight
      razor. "Take thee a barber's razor." --Ezek. v. 1.
      [1913 Webster]

   2. a device used for shaving, having a replaceable blade with
      a very sharp edge; also called safety razor. Also a
      similar device, made of plastic, in which the blade is
      neither replaceable nor can be sharpened, intended to be
      discarded after the blade dulls -- called a disposable
      razor.
      [PJC]

   3. (Zool.) A tusk of a wild boar.
      [1913 Webster]

   Razor fish. (Zool.)
      (a) A small Mediterranean fish (Coryphaena novacula),
          prized for the table.
      (b) The razor shell.

   Razor grass (Bot.), a West Indian plant (Scleria
      scindens), the triangular stem and the leaves of which
      are edged with minute sharp teeth.

   Razor grinder (Zool.), the European goat-sucker.

   Razor shell (Zool.), any marine bivalve shell belonging to
      Solen and allied genera, especially Solen ensis (or
      Ensatella ensis), and Solen Americana, which have a
      long, narrow, somewhat curved shell, resembling a razor
      handle in shape. Called also razor clam, razor fish,
      knife handle.

   Razor stone. Same as Novaculite.

   Razor strap, or razor strop, a strap or strop used in
      sharpening razors.
      [1913 Webster]

WordNet (r) 3.0 (2006):

safety razor
    n 1: a razor with a guard to prevent deep cuts in the skin