cameo

A piece of jewelry, etc., carved in relief.

Aarfy's buxom trollop had vanished with her smutty cameo ring, and Nurse Duckett was ashamed of him because he had refused to fly more combat missions and would cause a scandal.

A single very brief appearance, especially by a prominent celebrity in a movie or song.

Famous comic book writer Stan Lee had a cameo in the Spider-Man movie. He was on screen for perhaps ten seconds, but aficionados distinctly remember him.

As they turned into Hertford Street they startled a robin from the poet's head on a barren fountain, and he fled away with a cameo note.

To appear in a cameo role.