Noun onyx has 1 sense

1. onyx - a chalcedony with alternating black and white bands; used in making cameos
   --₁ is a kind of chalcedony, calcedony
   --₁ has particulars: sardonyx
   

Onyx

Noun: A type of cryptocrystalline mineral consisting of fine-grained quartz and often displaying bands of various colors.

Example sentence: She admired the beautiful onyx pendant hanging from her necklace.

Noun: A semiprecious stone, typically black or dark-colored, used in jewelry and ornaments.

Example sentence: The onyx ring sparkled elegantly on her finger.

Adjective: Having the color black or dark, like onyx.

Example sentence: The room was decorated with onyx tiles, giving it a sophisticated look.

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