From ZooTerms (Dictionary of Invertebrate Zoology)
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article (noun; Latin diminutive artus, joint): 1. A distinct segment or jointed part or structure.

2. (Arthropoda) a. In Chelicerata, the serrated process on the chelicera of a tick. b. In Crustacea, a subdivision of the antennal or antennular flagella or appendage. c. In Insecta, a segment of a leg

See also: segment.