What does "navicular" mean?

Navicular: Shaped like a boat; cymbiform; scaphoid; as, the navicular glumes of most grasses; the navicular bone. 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.