Navicular a. : Of, pertaining to, or resembling, a boat or ship.

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

Navicular n. : The navicular bone.

Example:
What is Navicular and can horses still be rode if they have it?

Taxonomy
navicular bone, tendons, Bones, navicular, Horse anatomy, free encyclopedia, protrusion, navicular disease, distal phalanges, ligament, ankle, right foot, Skeleton, Human anatomy, talus, sesamoid bone, search, Antero.

Defination from the web:
navicular bone is one of the tarsal bones, found in the foot. ... It is an important structure in relation to lameness and is involved with a significant disease process called Navicular Disease. ...