WordReference Random House Unabridged Dictionary of American English © 2016
sard  (särd), 
  1. Mineralogy, Jewelrya reddish-brown chalcedony, used as a gem.
Also,sardius, sardine. 
  • Greek sárdios sardius
  • Latin sarda
  • Middle English 1350–1400

Collins Concise English Dictionary © HarperCollins Publishers::

sard /sɑːd/, sardius /ˈsɑːdɪəs/ n
  1. an orange, red, or brown variety of chalcedony, used as a gemstone. Formula: SiO2
    Also called: sardine
Etymology: 14th Century: from Latin sarda, from Greek sardios stone from Sardis

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