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Meaning of feldspathoid

feld•spath•oid

Pronunciation: (feld'spa-thoid", fel'-), [key]
—adj.
  1. of or pertaining to a group of minerals similar in chemical composition to certain feldspars except for a lower silica content.
—n.
  1. a mineral of this group, as nepheline.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.