Etymology
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lappet (n.)

"a small flap," 1570s; earlier "lobe of a body part" (early 15c.), from Middle English lappe "lap" (see lap (n.1)) + -et, diminutive suffix.

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Definitions of lappet

lappet (n.)
a fleshy wrinkled and often brightly colored fold of skin hanging from the neck or throat of certain birds (chickens and turkeys) or lizards;
Synonyms: wattle
lappet (n.)
a small lap on a garment or headdress;
lappet (n.)
medium-sized hairy moths; larvae are lappet caterpillars;
Synonyms: lappet moth
From wordnet.princeton.edu