noun ·3 syllables ·Rare ·Advanced level

Definitions

Noun

1. 1
   Potassium aluminum silicate, KAlSi₃O₈, a common feldspar of igneous, plutonic, and metamorphic rocks. Orthoclase is the main feldspar of pegmatite occurrences, where it is most commonly flesh-colored. Orthoclase is used in the ceramic and glass industries and as a decorative gravel. countable, uncountable
2. 2
   a white or colored monoclinic feldspar wordnet

Etymology

From ortho- + -clase.

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.