Feldspathoid definitions

fĕld-spăth'oid', fĕl-
Any of a group of relatively rare minerals that are chemically very similar to feldspars, but have too little silica to qualify as feldspars.
noun
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Any of a group of relatively rare minerals that are chemically very similar to feldspars, but have too little silica to qualify as feldspars. Feldspathoids occur in igneous rocks with little or no silica.
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Origin of feldspathoid

feldspath (obsolete variant of feldspar) (from obsolete German Feldspath feldspar feldspar) –oid