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.
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   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]