a pennywort.
navicular adj. & n.
--adj navigable adj.1 (of a river, the sea, etc.) affording a passage for ships.
2 (of a ship etc.) seaworthy (in navigable condition).
3 (of a balloon, airship, etc.) steerable.
Derivatives:
navigability n.
Etymology: F navigable or L navigabilis (as NAVIGATE)