1. An agate with sard and white chalcedony in alternate layers.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• sardonix,
• aardonyx,
• zardonyx,
• xardonyx,
• dardonyx,
• eardonyx,
• wardonyx,
• szrdonyx,
• ssrdonyx,
• swrdonyx,
• sqrdonyx,
• saedonyx,
• saddonyx,
• safdonyx,
• satdonyx,
• sardonyxs,
• sardonx,
• sardonnix,
• sardonyks,
• sardanix

• sardonic,
• sardina,
• sardinia,
• sardinas,
• sardinha,
• sardine.

The adjective form of the word "sardonyx" is "sardonic".

The plural form of the word "sardonyx" is "sardonyxes" or "sardonyces".

The singular form of the word "sardonyx" is "sardonyx". It does not have a distinct singular form as it is used as the same word in both singular and plural contexts.