iris

¹ American  

[ahy-ris] / ˈaɪ rɪs /

noun

plural

irises, irides

1. Anatomy. the contractile, circular diaphragm forming the colored portion of the eye and containing a circular opening, the pupil, in its center.

2. Botany. any plant of the genus Iris, having showy flowers and sword-shaped leaves.

3. a flower of this plant.

4. (initial capital letter) a messenger of the gods, regarded as the goddess of the rainbow.

5. a rainbow.

6. any appearance resembling a rainbow.

7. Movies, Television. an iris-in or iris-out.

8. Optics, Photography. iris diaphragm.

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verb (used without object)

1. Movies. to begin or end a take or scene with an iris-in or iris-out, achieved by manipulation of an iris diaphragm on the camera or by editing the film.

Iris ² American  

[ahy-ris] / ˈaɪ rɪs /

noun

1. a female given name.

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Iris ¹ British  

/ ˈaɪrɪs /

noun

1. the goddess of the rainbow along which she travelled to earth as a messenger of the gods

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iris ² British  

/ ˈaɪrɪs /

noun

1. the coloured muscular diaphragm that surrounds and controls the size of the pupil

2. Also called: fleur-de-lys.  any plant of the iridaceous genus Iris, having brightly coloured flowers composed of three petals and three drooping sepals See also flag 3 orris 1 stinking iris

3. Also called: rainbow quartz.  a form of quartz that reflects light polychromatically from internal fractures

4. a rare or poetic word for rainbow

5. something resembling a rainbow; iridescence

6. short for iris diaphragm

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iris Scientific  

/ ī′rĭs /

plural

irises

1. The colored, muscular ring around the pupil of the eye in vertebrate animals, located between the cornea and lens. Contraction and expansion of the iris controls the size of the pupil, thereby regulating the amount of light reaching the retina.

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iris Cultural  

1. The colored membrane of the eye, surrounding the pupil, which by contracting and expanding regulates the amount of light that enters the eye.

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Etymology

Origin of iris

First recorded in 1350–1400; Middle English, from Latin Īris, īris, from Greek Îris, îris “rainbow, goddess of the rainbow, halo, iris flower or root, iridescent crystal”; in some senses, from New Latin, from Greek: “diaphragm of eye”

Example Sentences

“You can’t change your iris if someone does manage to get ahold of that information.”

From The Wall Street Journal • Feb. 26, 2026

Sitting on his living room couch this week, Rodriguez said doctors told him the projectile that hit him in his eye damaged his iris, cornea and lens.

From Los Angeles Times • Jan. 16, 2026

IriHealth is preparing to launch, for only about $50, a small smartphone extension that would scan a user's iris.

From Barron's • Jan. 12, 2026

Other procedures like laser depigmentation and iris implants have also been used to change the eye color, but may result in corneal damage or vision loss as well.

From Salon • May 4, 2025

His eyes were so wide that the white showed all around the iris, and he was clutching the edge of the table with a trembling hand.

From "The Amber Spyglass" by Philip Pullman