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usually uncountable, plural sardiuses
(mineralogy) sard quotations examples
The fifth, sardonyx; the sixth, sardius; the seventh, chrysolyte; the eighth, beryl; the ninth, a topaz; the tenth, a chrysoprasus; the eleventh, a jacinth; the twelfth, an amethyst.
1611, The Holy Bible, […] (King James Version), London: […] Robert Barker, […], Revelation 21:20