Masculine noun · From the base of σάρδιον (G4556) and onux (the nail of a finger, hence the "onyx" stone)
From the base of G4556 and ὄνυξ ónyx (the nail of a finger; hence the "onyx" stone); a "sardonyx", i.e. the gem so called:—sardonyx.
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Strongs concordance