2 Answers

Godess of the Rainbow -- Greek mythology, I think.  It’s a part of the eye too. For more information, Google on or wait for someone who knows what’s what.  : )   You’re new here. Welcome.

The iris (plural: irides or irises) is a thin, circular structure in the eye, responsible for controlling the diameter and size of the pupils and thus the amount of light reaching the retina. "Eye color" is the color of the iris, which can be green, blue, or brown. In some cases it can be hazel (a combination of light brown, green and gold), grey, violet, or even pink. In response to the amount of light entering the eye, muscles attached to the iris expand or contract the aperture at the center of the iris, known as the pupil. The larger the pupil, the more light can enter.

 it can also mean a bulb from a flower