What is an iris?

The pigmented, round, contractile membrane of the eye, suspended between the cornea and lens and perforated by the pupil. It regulates the amount of light entering the eye.

Any of numerous plants of the genus Iris, having narrow sword-shaped leaves and showy, variously colored flowers.

A rainbow or rainbowlike display of colors.

An iris diaphragm.



Or did you mean: Iris (in Greek mythology), iris (Stargate), iris (anatomy), IRIS International, Inc. (NASD: IRIS), IRIS (technology), Iris (2001 film), Iris (first name)

What is an iris?
-The pigmented, round, contractile membrane of the eye, suspended between the cornea and lens and perforated by the pupil. It regulates the amount of light entering the eye.

-Any of numerous plants of the genus Iris, having narrow sword-shaped leaves and showy, variously colored flowers.

-A rainbow or rainbowlike display of colors.

-An iris diaphragm.

-The goddess of the rainbow and messenger of the gods.

-the opaque muscular contractile diaphragm that is suspended in the aqueous humor in front of the lens of the eye, is perforated by the pupil and is continuous peripherally with the ciliary body, has a deeply pigmented posterior surface which excludes the entrance of light except through the pupil and a colored anterior surface which determines the color of the eyes :-)
Reply:iris



iris [?riss]

(plural irises)

noun

1. anatomy part of eye: the coloured part of the eye that consists of a muscular diaphragm surrounding the pupil and regulating the light entering the eye by expanding and contracting the pupil

2. plants flowering plant: a plant with long sword-shaped leaves and large brightly coloured flowers.

Genus: Iris Also called fleur-de-lis

3. meteorology rainbow: a rainbow (literary)

4. colours rainbow show of colours: a show of colours of various hues, like a rainbow

5. photography See iris diaphragm





[15th century. Directly, or via modern Latin , from Greek iris, Iris , ‘rainbow’ (or the messenger-goddess personifying it), ‘iris (of the eye), iris (the flower)’.]
Reply:There are many deffinitions for an iris

1.The goddess of the rainbow and messenger of the gods. (Greek Mythology)

2.The pigmented, round, contractile membrane of the eye, suspended between the cornea and lens and perforated by the pupil. It regulates the amount of light entering the eye.

3.Any of numerous plants of the genus Iris, having narrow sword-shaped leaves and showy, variously colored flowers.