either of the leglike second pair of appendages of spiders and other arachnids, variously developed for grasping, sensing, fertilizing, etc.
See pedipalp in American Heritage Dictionary 4
(pĕdˈə-pălpˌ)
noun
One of the second pair of appendages near the mouth of a spider or other arachnid that are modified for various reproductive, predatory, or sensory functions.