Pow"er*ful (?), a. 1.
Full of power; capable of producing great effects of any kind;
potent; mighty; efficacious; intense; as, a powerful man or
beast; a powerful engine; a powerful argument; a
powerful light; a powerful vessel.
The powerful grace that lies
In herbs, plants, stones, and their true qualities.
Shak.
2. (Mining) Large; capacious; -- said
of veins of ore.
Syn. -- Mighty; strong; potent; forcible; efficacious;
energetic; intense.
-- Pow"er*ful*ly, adv. --
Pow"er*ful*ness, n.