Source : Webster's Revised Unabridged Dictionary (1913)

Lop \Lop\, v. i.
   To hang downward; to be pendent; to lean to one side.

Lop \Lop\, v. t.
   To let hang down; as, to lop the head.

Lop \Lop\, a.
   Hanging down; as, lop ears; -- used also in compound
   adjectives; as, lopeared; lopsided.

Lop \Lop\, n. [AS. loppe.]
   A flea.[Obs.] --Cleveland.

Lop \Lop\, v. t. [imp. & p. p. {Lopped}; p. pr. & vb. n.
   {Lopping}.] [Prov. G. luppen, lubben,to cut, geld, or OD.
   luppen, D. lubben.]
   1. To cut off as the top or extreme part of anything; to sho?
      -- by cutting off the extremities; to cut off, or remove
      as superfluous parts; as, to lop a tree or its branches.
      ``With branches lopped, in wood or mountain felled.''
      --Milton.

            Expunge the whole, or lop the excrescent parts.
                                                  --Pope.

   2. To cut partly off and bend down; as, to lop bushes in a
      hedge.

Lop \Lop\, n.
   That which is lopped from anything, as branches from a tree.
   --Shak. Mortimer.

Source : WordNet®

lop
     v 1: cut off from a whole; "His head was severed from his body";
          "The soul discerped from the body" [syn: {discerp}, {sever}]
     2: cultivate, tend, and cut back the growth of; "dress the
        plants in the garden" [syn: {snip}, {clip}, {crop}, {trim},
         {dress}, {prune}, {cut back}]
     [also: {lopping}, {lopped}]

Source : Free On-Line Dictionary of Computing

LOP
     
        A language based on {first-order logic}.
     
        ["SETHEO - A High-Perormance Theorem Prover for First-Order
        Logic", Reinhold Letz et al, J Automated Reasoning
        8(2):183-212 (1992)].