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n. pl. pal·pi (-pī)
See palp.

[Latin, a toweling, the soft palm of the hand; see palp.]
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.


(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.
References in periodicals archive ?
Maxillary palpus covered with light yellow scales, labial palpus drooping and covered with grayish scales.
Eye bare; arista bare; ocellar seta proclinate, short or weak; outer vertical seta reduced, indistinguishable from postocular seta; frontal setae descending to level of upper third of parafacial, flanked by irregular row of shorter setae; fronto-orbital plate with short and thin setulae from vertex level to lowermost frontal seta; one reclinate orbital seta; proclinate orbital seta absent; parafacial bare except for a few hairs below lowest frontal seta; arista tapering smoothly to apex; first aristomere short; second aristomere slightly longer than wide; vibrissa stout, inserted above level of lower facial margin; palpus clavate, slightly bowed on apical third and slightly longer than prementum; lower facial margin slightly projected; genal dilation covered with thin black setulae.
Chelicera, palpus, and first leg of holotype on microscope slide, SMF cat.
Palpus (n = 5) with four segments, all cylindrical with setae, and segment 1 shorter than the others, 0.07-0.09 mm long; segment 2, 0.11-0.13 mm long; segment 3, 0.09 mm long; and segment 4, 0.10-0.12 mm long.
Outer maxillipeds placed nearly longitudinally; merus and ischium fused, a demarcation line sometimes visible between them; palpus three segmented, carpus slightly longer than subtrapezoidal propodus, dactylus articulated disto-medially on ventral margin of subtrapezoidal propodus, overreaching it considerably.
The morphogenesis of the adult Drosophila mouthparts, the maxillary palpus and proboscis, requires four Hox genes: labial (lab), Deformed (Dfd), pb, and Sex combs reduced (Scr) [3-7].
Inner face of the third antennal segment dark brown; palpus yellowish with dark distal region; gena with lower half blackish and upper half pale brown.
The palpus was destroyed in the process of slide preparation.