1. 虹膜
The iris is the round coloured part of a person's eye.

2. 鸢尾属植物
An iris is a tall plant with long leaves and large purple, yellow, or white flowers.

1. diaphragm consisting of thin overlapping plates that can be adjusted to change the diameter of a central opening

Synonym: iris diaphragm

2. muscular diaphragm that controls the size of the pupil which in turn controls the amount of light that enters the eye
it forms the colored portion of the eye

3. plants with sword-shaped leaves and erect stalks bearing bright-colored flowers composed of three petals and three drooping sepals

Synonym: flagfleur-de-lissword lily