phonolite definition by Webster's New World
a fine-grained, extrusive igneous rock consisting chiefly of alkali feldspar and nepheline
Origin: French phonolithe ; from phono- (see phono-) plush -lithe (see -lite): translated, translation of German klingstein ; from klingen, to ring, clink plush stein, stone
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
- phonolitic adjective
phonolite definition by American Heritage Dictionary
A light-colored volcanic rock composed largely of feldspars.
- phoˌno·litˈic adjective