pseudoscorpion

[soo-doh-skawr-pee-uhn]
noun
any of several small arachnids of the order Chelonethida that resemble a tailless scorpion and that feed chiefly on small insects.
Also called book scorpion.


Origin:
1825–35; < Neo-Latin Pseudoscorpionidae former name of the group; see pseudo-, scorpion

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pseudoscorpion

any of the 1,700 species of the order Pseudoscorpiones (sometimes Chelonethida) of the arthropod class Arachnida. They resemble true scorpions but are tailless and only 1 to 7.5 millimetres (0.04 to 0.3 inch) long. The chelicerae (first pair of appendages) bear silk-gland openings, and the pedipalps (second pair of appendages) are venomous pincers. In courtship the male may show protrusible structures ("ram's horns") on the belly.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Unless you've been living in a cave, you probably haven't run across this new species of poisonous, nearly blind pseudoscorpion.
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