Ruby

1. A clear, deep, red variety of corundum, valued as a precious stone.
2. A red spinel.
3. A deep red colour.
4. The tincture red or gules.
5. The size of type between pearl and nonpareil, standardized as 5½-point.
6. A ruby hummer, a South American hummingbird, Clytolaema rubricauda.
7. A red bird-of-paradise, Paradisaea rubra.

verb

To make red; to redden.

adjective

Of a deep red colour.

noun

A pronunciation guide written above or beside Chinese or Japanese characters.