Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio.
- something cast or thrown up
- Geol. upthrow (sense )
- Mining a ventilating shaft for returning air to the surface
- thrown upward
- directed upward
Used by arrangement with John Wiley & Sons, Inc.
The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Directed or thrown upward: upcast volcanic ash.noun
- Something cast upward.
- A ventilating shaft, as in a mine.