pedipalp

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun One of the second pair of appendages near the mouth of a chelicerate, such as a spider or horseshoe crab, used for various reproductive, predatory, or sensory functions.

from The Century Dictionary.

• noun A maxillipalp, or maxillary palpus; the palp of an arachnidan.
• noun A pedipalpate arachnidan.
• Of or pertaining to a pedipalpus; resembling a pedipalp. Also pedipalpal.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Zoöl.) One of the Pedipalpi.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun Either of a second pair of appendages, near the mouth of a spider, homologous to the mandibles in crustaceans.