groundmass Hear it!

groundmass definition

ground·mass (gro̵und′mas′)

noun

Geol. the small-grained matrix in which larger crystals are embedded

Webster's New World College Dictionary Copyright © 2005 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

Comments
Improve this definition.
Do you have more to add? Share your linguistic knowledge or observation.
/Register to save your comments.