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or irid-
1. Rainbow: iridescent.
2. Iris of the eye: iridectomy.
3. Iridium: iridosmine.

[From Latin īris, īrid-, rainbow, from Greek; see wei- in Indo-European roots.]


or before a vowel


combining form
1. (Anatomy) denoting the iris of the eye or the genus of plants: iridaceous.
2. denoting a rainbow: iridescent.
[from Latin irid-, iris]


(ˈaɪ rɪs)

n., pl. i•ris•es; esp. for 1,8 ir•i•des (ˈɪr ɪˌdiz, ˈaɪ rɪ-) for 2,3 i•ris; n.
1. the contractile, circular diaphragm forming the colored portion of the eye and containing an opening, the pupil, in its center.
2. any plant of the genus Iris, having flowers with three upright petals and three drooping, petallike sepals.
3. a flower of this plant.
4. (cap.) an ancient Greek goddess of the rainbow and messenger of the gods.
5. a rainbow.
[1350–1400; Middle English < Latin Īris, īris < Greek Îris, îris rainbow]
References in periodicals archive ?
INTRODUCTION: Irido- ciliary cysts are uncommon occurrence in the human eye.