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One of a pair of elongated, often segmented appendages usually found near the mouth in invertebrate organisms such as mollusks, crustaceans, and insects, the functions of which include sensation, locomotion, and feeding. Also called palpus.

[French palpe, from New Latin palpus, from Latin, a touching; see pāl- in Indo-European roots.]

pal′pal (păl′pəl) adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(pælp) or


n, pl palps or palpi (ˈpælpaɪ)
1. (Zoology) either of a pair of sensory appendages that arise from the mouthparts of crustaceans and insects
2. (Zoology) 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]
ˈpalpal adj
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈpæl pəs)

n., pl. -pi (-pī).
an appendage attached to an oral part and serving as an organ of sense in insects, crustaceans, etc.
[1805–15; < New Latin; Latin palpus or palpum palm of the hand]
palp′al, adj.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.


A segmented organ extending from the mouthparts of arthropods, used for touch or taste.
The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
References in periodicals archive ?
Examination of over 800 preserved Nephilengys specimens shows high frequencies of female plugging (21 %) and male palpal severance (50%).
capensis (approximately 1.5 times longer than wide); male palpal patellar apophysis broader and more dorsally placed, and tibial apophysis more prolaterally placed than in S.
For scanning electron microscopy palpal brushes were sputtered with gold and viewed from various directions in a Zeiss DSM 950.
Palpal tibia short, single apophysis with long additional terminal spike (Figs 14-17).
According to Gray (1995), palpal characters of the genus show some resemblance to those of the filistatine genera but relationships of Microfilistata remain unresolved.
Palpal femur with two dark spots on ventral surface, one medially and second apically.
However, both copulatory plugs and palpal structures in the female genital tract are less than 100% effective at preventing female remating in many spiders (references in Huber 2005; Schneider et al.
Roewer (1934) included Chinchippus in the ammotrechid subfamily Saronominae based on the segmentation of legs I, II, and IV and the palpal spination.
The unusual genus Lessertina Lawrence, 1942, considered by Bosselaers and Jocque (2000) to be Corinnidae incertae sedis and later as a Trachelinae genus (Bosselaers & Jocque 2002), is here considered Corinnidae incertae sedis due to conflicting genitalic morphology with other Trachelinae (particularly a palpal median apophysis and conductor in males) and ambiguity as to the homology of the "ventral cusp" on the anterior metatarsi.
Male palpal organs were expanded by immersion in 10% potassium hydroxide at room temperature for several minutes and transferring them back and forth between KOH and distilled water until the desired expansion took place.