either of the leglike second pair of appendages of spiders and other arachnids, variously developed for grasping, sensing, fertilizing, etc.
Origin:
ModL pedipalpus: see pedi- & palpus
See pedipalp in American Heritage Dictionary 4
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.