Usually means: Common feldspar mineral, potassium aluminum.
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We found 23 dictionaries that define the word orthoclase:

General (19 matching dictionaries)
  1. orthoclase: Merriam-Webster
  2. orthoclase: Oxford Learner's Dictionaries
  3. orthoclase: American Heritage Dictionary of the English Language
  4. orthoclase: Collins English Dictionary
  5. orthoclase: Vocabulary.com
  6. orthoclase: Wordnik
  7. orthoclase: Wiktionary
  8. orthoclase: Webster's New World College Dictionary, 4th Ed.
  9. orthoclase: The Wordsmyth English Dictionary-Thesaurus
  10. orthoclase: Infoplease Dictionary
  11. orthoclase: Dictionary.com
  12. Orthoclase: Wikipedia, the Free Encyclopedia
  13. Orthoclase: Online Plain Text English Dictionary
  14. orthoclase: Webster's Revised Unabridged, 1913 Edition
  15. orthoclase: Rhymezone
  16. Orthoclase: AllWords.com Multi-Lingual Dictionary
  17. orthoclase: FreeDictionary.org
  18. orthoclase: Mnemonic Dictionary
  19. orthoclase: TheFreeDictionary.com

Computing (1 matching dictionary)
  1. orthoclase: Encyclopedia

Medicine (1 matching dictionary)
  1. online medical dictionary (No longer online)

Science (2 matching dictionaries)
  1. Orthoclase: Eric Weisstein's World of Chemistry
  2. ORTHOCLASE: The Mineral Gallery

(Note: See orthoclases as well.)

Definitions from Wiktionary (orthoclase)

noun:  (mineralogy) 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.

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