pitchstone Hear it!

pitchstone definition

pitch·stone (pic̸h′stōn′)

noun

a volcanic glass that somewhat resembles pitch and has a higher percentage of water than obsidian or other glassy rocks

Etymology: calque of Ger pechstein < pech (< L pix), pitch + stein, stone

Webster's New World College Dictionary Copyright © 2009 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.