The Collaborative International Dictionary of English v.0.48:

Plow \Plow\, Plough \Plough\ (plou), n. [OE. plouh, plou, AS.
   pl[=o]h; akin to D. ploeg, G. pflug, OHG. pfluog, pfluoh,
   Icel. pl[=o]gr, Sw. plog, Dan. ploug, plov, Russ. plug',
   Lith. plugas.]
   1. A well-known implement, drawn by horses, mules, oxen, or
      other power, for turning up the soil to prepare it for
      bearing crops; also used to furrow or break up the soil
      for other purposes; as, the subsoil plow; the draining
      plow.
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            Where fern succeeds ungrateful to the plow.
                                                  --Dryden.
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   2. Fig.: Agriculture; husbandry. --Johnson.
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   3. A carucate of land; a plowland. [Obs.] [Eng.]
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            Johan, mine eldest son, shall have plowes five.
                                                  --Tale of
                                                  Gamelyn.
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   4. A joiner's plane for making grooves; a grooving plane.
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   5. (Bookbinding) An implement for trimming or shaving off the
      edges of books.
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   6. (Astron.) Same as Charles's Wain.
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   Ice plow, a plow used for cutting ice on rivers, ponds,
      etc., into cakes suitable for storing. [U. S.]

   Mackerel plow. See under Mackerel.

   Plow alms, a penny formerly paid by every plowland to the
      church. --Cowell.

   Plow beam, that part of the frame of a plow to which the
      draught is applied. See Beam, n., 9.

   Plow Monday, the Monday after Twelth Day, or the end of
      Christmas holidays.

   Plow staff.
      (a) A kind of long-handled spade or paddle for cleaning
          the plowshare; a paddle staff.
      (b) A plow handle.

   Snow plow, a structure, usually [Lambda]-shaped, for
      removing snow from sidewalks, railroads, etc., -- drawn or
      driven by a horse or a locomotive.
      [1913 Webster] Plow