— sanidinic /san'i din"ik/ , adj.
/san"i deen', -din/ , n. Mineral.
a glassy, often transparent variety of orthoclase in which sodium may replace as much as 50 percent of the potassium: forms phenocrysts in some igneous rocks.
[ 1805-15; Sanidin, equiv. to Gk sanid- (s. of sanís plank) + G -in -INE 2 ]