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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) A proximal bone on the radial side of the carpus; the scaphoid. Navicular disease (Far.), a disease affecting the navicular bone, or the adjacent parts, in a horse's foot. [1913 Webster]