معنی کلمه :‌ formidable

Exciting fear or apprehension; impressing dread; adapted to excite fear and deter from approach, encounter, or undertaking; alarming.

A genus of gigantic seaweeds. Note: Nereocystis Lutkeana, of the North Pacific, has a stem many fathoms long, terminating in a great vesicle, which is crowned with a tuft of long leaves. The stem is used by the Alaskans for fishing lines.