Palpus n. : 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.

Example:
What is the Palpi used for in a grasshopper?

Taxonomy
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Defination from the web:
palpus in the Online Dictionary. Meaning of palpus. Pronunciation of palpus. Translations of palpus. palpus synonyms, palpus antonyms. Information about palpus in the free online English dictionary and encyclopedia.