- An ingredient of this Mosaic incense, possibly the operculum of some sort of strombus.
- The valuable rock onyx.
- a component associated with the Mosaic incense, most likely the operculum of some sort of strombus.
- The valuable stone known as onyx.
- The layer or operculum of a species of mollusk, found in India and elsewhere, and emitting, when burned, a musky smell.
- The onyx.