palpus

[ pal-puhs ]

/ ˈpæl pəs /

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noun, plural pal·pi

[pal-pahy]. /ˈpæl paɪ/.

an appendage attached to an oral part and serving as an organ of sense in insects, crustaceans, etc.

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Origin of palpus

1805–15; <New Latin, special use of Latin palpus a stroking, caress, palm of the hand; akin to feel

Near the root or base of the mandibles on each side is a jointed feeler, or palpus; but spiders have no antenn.
An Elementary Text-book of the Microscope|John William Griffith
The labium in Japyx is four-lobed and bears a small two-jointed palpus.
Our Common Insects|Alpheus Spring Packard
The palpus, too, on this side was turned back to correspond to the direction of the legs nearest it.
Studies in the Psychology of Sex, Volume 3 (of 6)|Havelock Ellis
Its true function appears to be that of an extra palpus or "feeler."
Appletons' Popular Science Monthly, March 1899|Various

The palpus of the male (fig. 339) has large and complicated appendages at the end.
The Common Spiders of the United States|James Henry Emerton