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[Middle English, from Old English, from Late Latin, from Greek (lithos) sardios, from Greek sardius (stone), variant of sardion, sardius, perhaps from Sardeis, Sardis.]
1. (Bible) Old Testament a precious stone, probably a ruby, set in the breastplate of the high priest
2. (Minerals) another name for sard
[C14: via Late Latin from Greek sardios, from Sardeis Sardis]