Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • adjective Having right-angled cleavage.

from The Century Dictionary.

  • Characterized by cleavages at right angles to one another: said of certain species of the feldspar group, particularly orthoclase; pertaining to such species, or specifically to orthoclase.

from the GNU version of the Collaborative International Dictionary of English.

  • adjective (Crystallog.) Breaking in directions at right angles to each other; -- said of the monoclinic feldspars.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • adjective crystallography Having cleavage planes at right angles; as in orthoclase.

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

ortho- +‎ Ancient Greek κλαστός (klastos, "broken") +‎ -ic

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