Yes, iris is a Scrabble word!
...and is worth 4 points in Scrabble, and 4 points in Words with Friends
iris
Noun
1. Plants with sword-shaped leaves and erect stalks bearing bright-colored flowers composed of three petals and three drooping sepals
2. 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
3. Diaphragm consisting of thin overlapping plates that can be adjusted to change the diameter of a central opening
What Scrabble words can I make with the letters in iris?
3 Letter Words
2 Letter Words