The Collaborative International Dictionary of English v.0.48:

Lop \Lop\, a.
   Hanging down; as, lop ears; -- used also in compound
   adjectives; as, lopeared; lopsided.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Lop \Lop\, n. [AS. loppe.]
   A flea. [Obs.] --Cleveland.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Lop \Lop\ (l[o^]p), 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
      shorten 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.
      [1913 Webster]

            Expunge the whole, or lop the excrescent parts.
                                                  --Pope.
      [1913 Webster]

   2. To cut partly off and bend down; as, to lop bushes in a
      hedge.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Lop \Lop\, n.
   That which is lopped from anything, as branches from a tree.
   --Shak. Mortimer.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Lop \Lop\, v. i.
   To hang downward; to be pendent; to lean to one side.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Lop \Lop\, v. t.
   To let hang down; as, to lop the head.
   [1913 Webster]

WordNet (r) 3.0 (2006):

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

Moby Thesaurus II by Grady Ward, 1.0:

92 Moby Thesaurus words for "lop":
   abscind, amputate, annihilate, bag, bagging, baggy, ballooning,
   ban, bar, bob, bounce, bound, cascade, clip, crop, cull, cut,
   cut away, cut off, cut out, daggle, dangle, depend, dock, drabble,
   drag, draggle, drape, droop, drooping, droopy, eliminate,
   enucleate, eradicate, except, excise, exclude, extinguish,
   extirpate, fall, flap, flop, floppy, flow, hang, hang down, hop,
   hurdle, isolate, knock off, leap, limp, loll, lollop, loose,
   lop-eared, loppy, mutilate, nip, nod, nodding, pare, peel, pend,
   pick out, prune, root out, rule out, sag, sagging,
   sagging in folds, saggy, set apart, set aside, shave, shear, slump,
   spring, stamp out, strike off, strip, strip off, swag, swing,
   take off, take out, trail, trollop, truncate, vault, weep,
   wipe out



V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

LOP
       Language Orientated Programming


V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

LOP
       Loss of Pointer (UNI)


The Free On-line Dictionary of Computing (30 December 2018):

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)].