from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A relatively rare blue, violet-blue, or greenish-blue translucent mineral, Na4-5Al3Si3O12S, the chief component of lapis lazuli.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A mineral of metamorphosed limestones. Lazurite forms the gemstone lapis lazuli, and crushed lazurite provided the ultramarine color in artists' paint of the old masters. sodalite and lazurite form the sodalite group of silicate minerals. Chemical composition: Sodium aluminum silicate with sulphur, .
from The Century Dictionary and Cyclopedia
- n. The sodium-aluminium silicate which forms the essential part of the ornamental stone lapis lazuli.
Medieval Latin lāzur, lapis lazuli (from Arabic lāzaward; see lapis lazuli) + -ite1.(American Heritage® Dictionary of the English Language, Fourth Edition)
From Medieval Latin lazur ("lapis lazuli"), from Arabic (lzaward), because of the similar, distinctive blue coloring. (Wiktionary)