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From Wikipedia: The navicular bone occurs in human and horse anatomy.The navicular bone is one of the tarsal bones, found in the foot. Its name derives from the bone's resemblance to a small boat, caused by the strongly concave proximal articular surface. The term navicular bone or hand navicular bone was formerly used for the scaphoid bone, one of the carpal bones of the wrist.It is located on the medial side of the foot, and articulates proximally with the talus, distally with the three cuneiform bones, and occasionally laterally with the cuboid. See more...

From The Collaborative International Dictionary of English v.0.48: Navicular \Na*vic"u*lar\, a. [L. navicularius, fr. navicula, dim. of navis ship: cf. F. naviculaire.] 1. Of, pertaining to, or resembling, a boat or ship. [1913 Webster] 2. Shaped like a boat; cymbiform; scaphoid; as, the navicular glumes of most grasses; the navicular bone. [1913 Webster] Navicular bone. (Anat.) (a) One of the middle bones of the tarsus, corresponding to the centrale; -- called also scaphoid. (b) ... See more description