n.
- The metalliferous ore that fills a fissure in a rock formation.
- A vein of mineral ore deposited between clearly demarcated layers of rock. Also called lead.
- A rich source or supply.
[Middle English, way, load, from Old English lād, way.]
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.