What combining form relates to the iris?

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The combining form that relates to the iris is "irid-." This term is derived from the Greek word "iris," which means rainbow, reflecting the colorful appearance of the iris in the human eye. In medical terminology, "irid-" is used to refer to conditions or structures associated with the iris. For example, "iridectomy" refers to the surgical removal of part of the iris, and "iridology" is a practice that claims to analyze the iris for health conditions.

The other options pertain to different parts of the eye: "pupil-" refers to the opening in the center of the iris where light enters, "corne-" pertains to the cornea, the clear front layer of the eye, and "sclera-" refers to the outer white covering of the eyeball. Each of these terms has its specific context in relation to the anatomy and physiology of the eye, but "irid-" is distinctly tied to the iris.