- irisA plant of the genus Iris, common in the northern hemisphere, and generally having attractive blooms (See Iris (plant) on Wikipedia.Wikipedia ).
- iridium(uncountable) A chemical element with an atomic number of 77: a very hard, brittle, silvery-white transition metal of the platinum group.
- iridalPertaining to a rainbow.
- iridencleisisA surgical procedure for glaucoma in which a portion of the iris is incised and incarcerated in a limbal incision.