The Collaborative International Dictionary of English v.0.48:

Lap \Lap\, v. t. [imp. & p. p. Lapped; p. pr. & vb. n.
   Lapping.]
   1. To rest or recline in a lap, or as in a lap.
      [1913 Webster]

            To lap his head on lady's breast.     --Praed.
      [1913 Webster]

   2. To cut or polish with a lap, as glass, gems, cutlery, etc.
      See 1st Lap, 10.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Lapping \Lap"ping\, n.
   A kind of machine blanket or wrapping material used by calico
   printers. --Ure.
   [1913 Webster]

   Lapping engine, Lapping machine (Textile Manuf.), A
      machine for forming fiber info a lap. See its Lap, 9.
      [1913 Webster]

WordNet (r) 3.0 (2006):

lapping
    n 1: covering with a design in which one element covers a part
         of another (as with tiles or shingles) [syn: imbrication,
         overlapping, lapping]

Moby Thesaurus II by Grady Ward, 1.0:

43 Moby Thesaurus words for "lapping":
   babbling, bridging, bubbling, burbling, compotation, drinking,
   drunkenness, guggling, gulping, gurgling, guzzling, imbibing,
   imbibition, imbricate, incumbent, lap, nipping, overarched,
   overlapping, overlying, plash, plashing, potation, pulling,
   quaffing, rippling, shingled, slipping, slosh, sloshing, spanning,
   splash, splashing, superincumbent, swash, swigging, swilling,
   swishing, symposium, tasting, trilling, wash, washing



Easton's 1897 Bible Dictionary:

Lapping
   of water like a dog, i.e., by putting the hand filled with water
   to the mouth. The dog drinks by shaping the end of his long thin
   tongue into the form of a spoon, thus rapidly lifting up water,
   which he throws into his mouth. The three hundred men that went
   with Gideon thus employed their hands and lapped the water out
   of their hands (Judg. 7:7).