boat shaped (botshapt)

Having the shape of a boat; navicular; cymbiform; hollow like a boat, as (in bot. ) the valves of some pericarps. Specifically, in ornith., applied to the tail of certain birds, Boat-shaped.-Tail of a Grackle. as the boat-tailed grackle, Quiscalus major, in which the plane of the feathers of each half meets that of the other half obliquely, slanting downward and toward the median line, and thus induces a reëntrance or hollow of the upper surface and a salience or keel below.