diaphragm consisting of thin overlapping plates that can be adjusted to change the diameter of a central opening | the contractile aperture in the center of the iris of the eye; resembles a large black dot |
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 | a learner who is enrolled in an educational institution |
plants with sword-shaped leaves and erect stalks bearing bright-colored flowers composed of three petals and three drooping sepals | a young person attending school (up through senior high school) |