| Word | Definitions | Synonyms |
|---|---|---|
| iris | (noun) diaphragm consisting of thin overlapping plates that can be adjusted to change the diameter of a central opening | Synonyms: iris diaphragm |
| (noun) 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 | - | |
| (noun) plants with sword-shaped leaves and erect stalks bearing bright-colored flowers composed of three petals and three drooping sepals | Synonyms: flag, fleur-de-lis, sword lily |