World English Dictionary
palp or palpus (pælp, ˈpælpəs)
n , pl palps, palpi
1.  either of a pair of sensory appendages that arise from the mouthparts of crustaceans and insects
2.  either of a pair of tactile organs arising from the head or anterior end of certain annelids and molluscs
[C19: from French, from Latin palpus a touching]
palpus or palpus (pælp, ˈpælpəs, ˈpælpaɪ)
[C19: from French, from Latin palpus a touching]
'palpal or palpus

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
palp   (pālp)  Pronunciation Key 
A segmented organ extending from the mouthparts of arthropods, used for touch or taste. Also called palpus.
The American Heritage® Science Dictionary
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