(a.) Shaped like a boat; (Bot.) elongated and having the upper surface decidedly concave, as the glumes of many grasses.

abysmal abyssal boat-shaped boatlike bottomless bowl-shaped bowllike cavelike commodious concave concaved craterlike cup-shaped cupped cymbiform deep as hell dish-shaped dished dishing dishlike fathomless funnel-breasted funnel-chested funnel-shaped gaping hollow hollowed incurved incurving incurvous infundibular infundibuliform navicular naviform plumbless plunging retiring retreating reverberant saucer-shaped scaphoid scyphate sepulchral soundless spoonlike sunk sunken unfathomable unfathomed unsounded vast without bottom yawning