WordReference Random House Unabridged Dictionary of American English © 2020
sar•di•us  (särdē əs),USA pronunciation n. 
  1. Mineralogy, Jewelrysard.
  2. Biblethe precious stone, thought to have been a ruby, in the breastplate of the Jewish high priest. Ex. 28:17.
  • Greek sárdios (stone) of Sardis
  • Latin
  • Middle English 1350–1400

WordReference Random House Unabridged Dictionary of American English © 2020
sard  (särd),USA pronunciation n. 
  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
'sardius' also found in these entries:
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