adjective / noun
red
RED/red/
The hue characteristic of blood.
The ripe tomatoes are bright red against their green leaves.

Etymology
Old English rēad covered shades including crimson, scarlet, pink, and purple. The comparison with blood was already established then, giving the modern color sense a direct connection to its early use.
In context
The difference between rubies and garnets. That's probably my biggest question cuz they're the two red stones.
More examples
- The artist mixes several reds for the sunset.
- The marchers carry red flags to show support for communism.
- On this election map, red marks states won by Republicans.
Forms
red · reds · redder · reddest
redness noun — The quality of being red.
redden verb — To become red or make red.