Definition of orthose in English:

orthose

noun

rare Mineralogy
  • A mineral which is the common form of potash feldspar.

Pronunciation

orthose

/ˈɔːθəʊs/ /ˈɔːθəʊz/

Origin

Early 19th century. From French orthose from ancient Greek ὀρθός right, straight; the ending is apparently arbitrary.