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

'sard' also found in these entries:
In the English description:

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