The Collaborative International Dictionary of English v.0.48:

Pedipalpi \Ped`i*pal"pi\, n. pl. [NL. See Pedipalpus.] (Zool.)
   A division of Arachnida, including the whip scorpions
   (Thelyphonus) and allied forms. Sometimes used in a wider
   sense to include also the true scorpions.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Pedipalpus \Ped`i*pal"pus\, n.; pl. Pedipalpi. [NL. See Pes,
   and Palpus.] (Zool.)
   One of the second pair of mouth organs of arachnids. In some
   they are leglike, but in others, as the scorpion, they
   terminate in a claw.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Pedipalpi
    n 1: whip scorpions [syn: Pedipalpi, order Pedipalpi,
         Uropygi, order Uropygi]