Coxa

from WordNet (r) 3.0 (2006)

coxa
    n 1: the ball-and-socket joint between the head of the femur and
         the acetabulum [syn: {hip}, {hip joint}, {coxa},
         {articulatio coxae}]

from The Collaborative International Dictionary of English v.0.48

Coxa \Cox"a\ (k?ks"?), n. [L., the hip.] (Zool.)
   The first joint of the leg of an insect or crustacean.
   [1913 Webster] Coxalgia

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