sardius
Concise Oxford English Dictionary © 2008 Oxford University Press:
sardius /ˈsɑːdɪəs/
▶noun a red precious stone mentioned in the Bible (e.g. Exod. 28:17) and in classical writings, probably ruby or carnelian.
– origin ME: via late L. from Gk sardios.
'sardius' also found in these Oxford entries:

