Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A relatively rare blue mineral, (Mg, Fe)Al2(PO4)2(OH)2, with a vitreous luster.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A semi-precious gemstone that is a basic phosphate of magnesium, iron and aluminium

from the GNU version of the Collaborative International Dictionary of English

  • n. A mineral of a light indigo-blue color, occurring in small masses, or in monoclinic crystals; blue spar. It is a hydrous phosphate of alumina and magnesia.

from The Century Dictionary and Cyclopedia

  • n. A mineral of a light- or indigo-blue color, crystallizing in the monoclinic system.

Etymologies

Medieval Latin lazulum, lapis lazuli; see lapis lazuli + -ite1.
(American Heritage® Dictionary of the English Language, Fourth Edition)

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