Source : Webster's Revised Unabridged Dictionary (1913)

Lappet \Lap"pet\, n. [Dim. of lap a fold.]
   A small decorative fold or flap, esp, of lace or muslin, in a
   garment or headdress. --Swift.

   {Lappet moth} (Zo["o]l.), one of several species of bombycid
      moths, which have stout, hairy caterpillars, flat beneath.
      Two common American species ({Gastropacha Americana}, and
      {Tolype velleda}) feed upon the apple tree.