Palpus \Pal"pus\, n.; pl. {Palpi}. [NL. See {Palp}.] (Zool.)
A feeler; especially, one of the jointed sense organs
attached to the mouth organs of insects, arachnids,
crustaceans, and annelids; as, the mandibular palpi,
maxillary palpi, and labial palpi. The palpi of male spiders
serve as sexual organs. Called also {palp}. See Illust. of
{Arthrogastra} and {Orthoptera}.
[1913 Webster]