sardonyx Smith-Hall sardonyx: sardŏnyx, y̆chis, f. (m. in Juv. 6, 382: densi radiant testudine tota sardonyches): Plin. 37, 6, 23, init.: Juv. 7, 144: adorned with s., sardŏny̆chātus, Mart. 2, 29, init.