noun In both senses also called ground sheet.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.
- A waterproof cover used to protect an area of ground, such as a baseball field.
- A waterproof sheet placed under camp bedding as a protection against moisture.