iris
nouns
plants with sword-shaped leaves and erect stalks bearing bright-colored flowers composed of three petals and three drooping sepals
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
is a type of (narrower)
a pliable sheet of tissue that covers or lines or connects the organs or cells of animals or plants
diaphragm consisting of thin overlapping plates that can be adjusted to change the diameter of a central opening
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