Webster's Revised Unabridged Dictionary · 1913

Lappet

Lappet , noun

[Dim. of lap a fold.]

A small decorative fold or flap, esp. of lace or muslin, in a garment or headdress. — Swift
Collocations (1)
Lappet moth (Zoology) , 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 , transitive verb

To decorate with, or as with, a lappet. [Rare] — Landor