Definition of "feldspathoid" []

• Any of a small group of igneous, plutonic, and volcanic minerals formed in magma that did not contain enough silica to satisfy all the chemical bonds. Feldspathoids are silica-poor variants of the feldspar group. (noun)
• Resembling a feldspar. (adjective)

Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License