‖n. pl. [ NL. See Pseudo-, and Scorpion. ] (Zool.) An order of Arachnoidea having the palpi terminated by large claws, as in the scorpions, but destitute of a caudal sting; the false scorpions. Called also Pseudoscorpii, and Pseudoscorpionina. See Illust. of Book scorpion, under Book. [ 1913 Webster ]