From ZooTerms (Dictionary of Invertebrate Zoology)
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coxa (noun; plural coxae; Latin coxa, hip): (Arthropoda) 1. The first or proximal segment of a leg that articulates basally with the wall of the thorax. 2. In Crustacea, the segment of an appendage adjoining the body sternite, except in forms having a precoxa

See also: coxopodite.