GNU Collaborative International Dictionary of English

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Found one definition

1.       
   ‖Crus (kr?s), n.; pl. Crura (krˈr). [L., the leg.] (Anat.) (a) That part of the hind limb between the femur, or thigh, and the ankle, or tarsus; the shank. (b) Often applied, especially in the plural, to parts which are supposed to resemble a pair of legs; as, “the crura of the diaphragm, a pair of muscles attached to it; crura cerebri, two bundles of nerve fibers in the base of the brain, connecting the medulla and the forebrain”.
   
   [1913 Webster]