‖Ar′thro‐gas″tra (�), n. pl. [NL., fr. Gr. ἄρθρον joint + � stomach.] (Zoöl.) A division of the Arachnida, having the abdomen annulated, including the scorpions, harvestmen, etc.; pedipalpi.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.