The Collaborative International Dictionary of English v.0.48:

Plough \Plough\, n. & v.
   See Plow.
   [1913 Webster]

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.
      [1913 Webster]

            Where fern succeeds ungrateful to the plow.
                                                  --Dryden.
      [1913 Webster]

   2. Fig.: Agriculture; husbandry. --Johnson.
      [1913 Webster]

   3. A carucate of land; a plowland. [Obs.] [Eng.]
      [1913 Webster]

            Johan, mine eldest son, shall have plowes five.
                                                  --Tale of
                                                  Gamelyn.
      [1913 Webster]

   4. A joiner's plane for making grooves; a grooving plane.
      [1913 Webster]

   5. (Bookbinding) An implement for trimming or shaving off the
      edges of books.
      [1913 Webster]

   6. (Astron.) Same as Charles's Wain.
      [1913 Webster]

   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

The Collaborative International Dictionary of English v.0.48:

Plow \Plow\, Plough \Plough\ (plou), v. i.
   To labor with, or as with, a plow; to till or turn up the
   soil with a plow; to prepare the soil or bed for anything.
   --Shak.
   [1913 Webster]

         Doth the plowman plow all day to sow ?   --Isa. xxviii.
                                                  24.
   [1913 Webster] Plowable

The Collaborative International Dictionary of English v.0.48:

Plow \Plow\, Plough \Plough\, v. t. [imp. & p. p. Plowed
   (ploud) or Ploughed; p. pr. & vb. n. Plowing or
   Ploughing.]
   1. To turn up, break up, or trench, with a plow; to till
      with, or as with, a plow; as, to plow the ground; to plow
      a field.
      [1913 Webster]

   2. To furrow; to make furrows, grooves, or ridges in; to run
      through, as in sailing.
      [1913 Webster]

            Let patient Octavia plow thy visage up
            With her prepared nails.              --Shak.
      [1913 Webster]

            With speed we plow the watery way.    --Pope.
      [1913 Webster]

   3. (Bookbinding) To trim, or shave off the edges of, as a
      book or paper, with a plow. See Plow, n., 5.
      [1913 Webster]

   4. (Joinery) To cut a groove in, as in a plank, or the edge
      of a board; especially, a rectangular groove to receive
      the end of a shelf or tread, the edge of a panel, a
      tongue, etc.
      [1913 Webster]

   To plow in, to cover by plowing; as, to plow in wheat.

   To plow up, to turn out of the ground by plowing.
      [1913 Webster] Plow

WordNet (r) 3.0 (2006):

Plough
    n 1: a group of seven bright stars in the constellation Ursa
         Major [syn: Big Dipper, Dipper, Plough, Charles's
         Wain, Wain, Wagon]
    2: a farm tool having one or more heavy blades to break the soil
       and cut a furrow prior to sowing [syn: plow, plough]
    v 1: move in a way resembling that of a plow cutting into or
         going through the soil; "The ship plowed through the water"
         [syn: plow, plough]
    2: to break and turn over earth especially with a plow; "Farmer
       Jones plowed his east field last week"; "turn the earth in
       the Spring" [syn: plow, plough, turn]

Easton's 1897 Bible Dictionary:

Plough
   first referred to in Gen. 45:6, where the Authorized Version has
   "earing," but the Revised Version "ploughing;" next in Ex. 34:21
   and Deut. 21:4. The plough was originally drawn by oxen, but
   sometimes also by asses and by men. (See AGRICULTURE.)