Quick Definition
σαρδόνυξ, υχος, ὁ n.m. sardonyx
Strong's Definition
hence the "onyx" stone); a "sardonyx", i.e. the gem so called
Derivation: from the base of G4556 (σάρδιος) and (the nail of a finger;
KJV Usage: sardonyx
UBS Dictionary of the Greek New Testament
UBS Dictionary of the Greek New Testament © United Bible Societies, licensed CC BY-SA 4.0.
Thayer's Greek Lexicon
Mounce Concise Greek Dictionary
σαρδόνυξ sardonyx 1x
sardonyx, a gem exhibiting the color of the carnelian and the white of the calcedony, intermingled in alternate layers, Rev. 21:20*
Abbott-Smith Greek Lexicon
* σαρδόνυξ (L, σαρδιόνυξ), -υχος, ὁ
(< σάρδιον, ὄνυξ),
sardonyx, a stone marked by the red of the sard and the white of the onyx: Re 21:20.†
Moulton & Milligan — Vocabulary of the Greek NT
σαρδόνυξ, ““sardonyx,” a variety of onyx (Rev 212°): cf. Pliny H.W. XxXxVil. 23: ‘*‘Sardonyches olim ut ex ipso nomine apparet intellegebantur candore in sarda, hoc est, velut carne ungui hominis imposita, et utroque translucido.”’
Liddell-Scott-Jones — Greek-English Lexicon
σαρδόνυξ (sardonux) — sardonyx. σαρδόνυξ, ῠχος, ὁ, (σάρδιον) sardonyx, [NT+4th c.BC+]The stone was called ὄνυξ when the dark ground was simply spotted or streaked with white, but σαρδόνυξ if the different colours were disposed in layers.