Pronunciation: (hī'grād'), [key]
—adj., v., -grad•ed, -grad•ing.
1. of excellent or superior quality.
2. (of ore) yielding a relatively large amount of the metal for which it is mined.
to steal (rich ore) from a mine.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.