palpus
noun
pal·pus ˈpal-pəs 
plural palpi ˈpal-ˌpī
-(ˌ)pē
: a segmented usually tactile or gustatory process on an arthropod mouthpart see insect illustration
Word History
Etymology
New Latin, from Latin, caress, soft palm of the hand, from palpare
First Known Use
1803, in the meaning defined above