What is large; capacious; -- said of veins of ore. -- Pow"er*ful*ly, adv. -- Pow"er*ful*ness, n called?

powerful — (Mining) Large; capacious; -- said of veins of ore. -- Pow"er*ful*ly, adv. -- Pow"er*ful*ness, n. (Webster's 1913.)

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