any small predatory arachnid of the order Pseudoscorpionida, which includes the book scorpion and is named from the claw-shaped palps, which are poison organs
See also book scorpion
false scorpion in British English
any small nonvenomous arachnid of the order Pseudoscorpionida (or Chelonethida), which superficially resemble scorpions but lack the long tail