lappet n
1 a small hanging flap or piece of lace, etc., such as one dangling from a headdress
2 (Zoology) a lobelike hanging structure, such as the wattle on a bird's head
(C16: from lap1 + -et)
♦
lappeted adj
lappet moth n
a large purple-brown hairy eggar moth, Gastropacha quercifolia, whose grey furry caterpillars have lappets on each flank