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.
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   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.
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            With speed we plow the watery way.    --Pope.
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   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):

plow
    n 1: 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: 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]
    2: act on verbally or in some form of artistic expression; "This
       book deals with incest"; "The course covered all of Western
       Civilization"; "The new book treats the history of China"
       [syn: cover, treat, handle, plow, deal, address]
    3: 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]

Moby Thesaurus II by Grady Ward, 1.0:

137 Moby Thesaurus words for "plow":
   all-crop harvester, backset, baler, bank, bean harvester,
   beet harvester, binder, break, breaker, canal, canalize, carve,
   cast plow, chamfer, channel, chisel, combine, corrugate,
   cotton picker, crab, crack, crimp, cultivate, cultivator, culture,
   cut, dado, delve, dig, dike, dip, disk, disk harrow, disk plow,
   ditch, drag, dress, drill, drill plow, engrave, fallow, feather,
   fertilize, fishtail, flute, force, four-bottom plow, furrow,
   gang plow, gash, goffer, gouge, grain harvester, groove, grub hook,
   gully, harrow, harvester, haymaker, header, hoe, hoe drill, incise,
   list, lister, lister cultivator, loop, middlebreaker,
   moldboard plow, mulch, peg-tooth harrow, planter, pleat,
   plow drill, porpoise, prairie breaker, press drill, prune,
   pull out, pull up, push down, rabbet, rake, ridge, rifle, roll,
   rotary plow, rut, scooter, score, scratch, seed plow, seeder,
   shovel plow, sideslip, skid, slit, snap machine, spade, spin,
   spiral, sprayer, spring-tooth harrow, stag gang, streak, striate,
   stunt, subsoil plow, sulky lister, sulky plow, swather,
   swivel plow, tedder, thin, thin out, thrasher, three-bottom plow,
   thresher, threshing machine, till, till the soil, trench,
   trench plow, trough, turn, turn over, turnplow, two-bottom plow,
   undulate, vineyard plow, walking plow, weed, weed out, windrower,
   work, wrinkle, yaw



The Devil's Dictionary (1881-1906):

PLOW, n.  An implement that cries aloud for hands accustomed to the
pen.