on·yx 
(ŏnĭks)
(ŏnĭks)n.
A chalcedony that occurs in bands of different colors and is used as a gemstone, especially in cameos and intaglios.
[Middle English onix, from Old French, from Latin onyx, from Greek onux, nail, onyx; see nogh- in the Appendix of Indo-European roots.]
- "Robert the Bruce."
- "Robert the Devil."
- Robert Traill Spence, Jr.
- Robert Treat
- Robert Tyre
- Robert Wilhelm
- Robert William
- Robert William
- Robeson
- Robespierre
- robin
- Robin Goodfellow
- Robin Hood
- robin redbreast
- robin's-egg blue
- Robinson
- Robinson
- Robinson
- Robinson
- Robinson
- Robinson
- Robinson
- Robinson
- Robinson Crusoe
- Robinson projection