名詞 iris:

1. plants with sword-shaped leaves and erect stalks bearing bright-colored flowers composed of three petals and three drooping sepals
   同義詞：flag, fleur-de-lis, sword lily
2. muscular diaphragm that controls the size of the pupil; it forms the colored portion of the eye
3. diaphragm consisting of thin overlapping plates that can be adjusted to change the diameter of a central opening
   同義詞：iris diaphragm

1. Surgical removal of part of the iris of the eye.
   虹膜切除術(shù)手術(shù)切除部分虹膜
2. Shaped like a sword, as the leaf of an iris.
   劍形的，如鳶尾屬植物的葉子
3. Inflammation of the iris of the eye.
   虹膜炎虹膜的感染發(fā)炎
4. Could you teach me how to adjust the iris of the camera?
   你能教我怎么調(diào)照相機的光圈嗎？

i.ris

n.（名詞）
【復(fù)數(shù)】 i.ris.es 或 i.ri.des [o.r-dôz., r.-]
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.
虹膜：眼睛中一層帶色素的，球形的可伸縮的薄膜，處于角膜和晶狀體之間，為瞳孔所穿過。它調(diào)節(jié)進入眼球的光的數(shù)量
Any of numerous plants of the genusIris, having narrow sword-shaped leaves and showy, variously colored flowers.
鳶尾：一種鳶尾 屬植物，有狹窄的劍狀葉和顯著的各色花朵
A rainbow or rainbowlike display of colors.
彩虹或彩虹般的色彩

來源：
Middle English [rainbow]
中古英語 [彩虹]
from Latin oris orid-
源自 拉丁語 oris orid-
from Greek [rainbow, iris of the eye] * see wei-
源自 希臘語 [彩虹；虹膜] *參見 wei-