Palpi

from The Collaborative International Dictionary of English v.0.48

Palpi \Pal"pi\ (p[a^]l"p[imac]), n.,
   pl. of {Palpus}. (Zool.) See {Palpus}.
   [1913 Webster]

from The Collaborative International Dictionary of English v.0.48

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]