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.

Lappet \Lap"pet\, v. t. [imp. & p. p. {Lappeted}; p. pr. & vb.
   n. {Lappeting}.]
   To decorate with, or as with, a lappet. [R.] --Landor.

Source : WordNet®

lappet
     n 1: a fleshy wrinkled and often brightly colored fold of skin
          hanging from the neck or throat of certain birds
          (chickens and turkeys) or lizards [syn: {wattle}]
     2: a small lap on a garment or headdress
     3: medium-sized hairy moths; larvae are lappet caterpillars
        [syn: {lappet moth}]