dew·lap 
(dlăp′, dy-)
(dlăp′, dy-)n.
1. A fold of loose skin hanging from the neck of certain animals.
2. A pendulous part similar to this, such as the wattle of a bird.
3. A fold of loose skin hanging from the neck of a person.
[Middle English dewlappe : dew, of unknown meaning (akin to Danish and Norwegian dog- in Danish doglæb and Norwegian doglæp, dewlap) + lappe, fold; see LAP2.]
dewlapmale anole