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lapis lazuli (n.)

"azure-stone, rich ultramarine silicate stone," early 15c., from Middle Latin lapis lazuli, literally "stone of azure," from Latin lapis "a stone" (see lapideous) + Medieval Latin lazuli, genitive of lazulum, from Arabic lazuward (see azure).

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Definitions of lapis lazuli from WordNet

lapis lazuli (n.)
an azure blue semiprecious stone;
Synonyms: lazuli
From wordnet.princeton.edu