Plural of “iris”

The plural of iris is irises (some dictionaries also accept irides).

Why

"Iris" comes from the Greek goddess of the rainbow, whose name was applied both to the colorful part of the eye and to the flower prized for its vivid, varied petals. English generally pluralizes the word regularly as "irises," though a rarer, more technical Greek-style plural, "irides," survives in specialized scientific and medical writing. Botanists formally adopted "Iris" as the genus name for the flower family in the 18th century, borrowing the goddess's name specifically because the genus includes species spanning nearly every color of the rainbow, a fitting tribute to the deity most associated with that exact phenomenon.

"Irides" reflects the word's genuine Greek grammatical background more closely than "irises" does, and it still appears occasionally in ophthalmology, optics, and taxonomy texts discussing the eye structure in a precise anatomical way, but it has never gained any real foothold in everyday English, where "irises" is used without exception for both the eye and the flower.

Usage note

"Irises" is the standard, safe plural in virtually every context a general writer will encounter, including gardening, art, and casual descriptions of eye color. "Irides" should be reserved for specialized ophthalmological or scientific writing, where a reader will recognize and expect the more technical form.

Iris, the Greek goddess, served specifically as a messenger between the gods and mortals, traveling along the rainbow, which is why her name attached both to the eye's colorful ring and to a flower whose petals span an unusually wide range of vivid hues. Ophthalmology and camera-lens engineering both use "iris" technically for a ring-shaped structure that controls how much light passes through an opening, a shared functional metaphor that connects the anatomical eye part to the mechanical aperture found in cameras and telescopes.

Common real mistakes

There's little risk of genuine confusion here, since "irises" covers nearly every situation; using "irides" outside a specialized scientific context will simply read as unusual or overly technical rather than as more correct. Writers should also avoid confusing the flower and eye senses within a single ambiguous sentence, since context alone distinguishes "she painted the irises" (likely the flower) from "the doctor examined the irises" (clearly the eye).

The wider pattern

"Iris" is one of several Greek-origin words in English that kept a specialized technical plural alive in a narrow scientific field while the word regularized completely everywhere else, a pattern also seen with "index," whose Latin-style plural "indices" survives strongly in mathematics while "indexes" dominates general use.

Examples

• The garden was full of purple and yellow irises.
• The ophthalmologist examined both irises for signs of inflammation.
• She painted a still life of irises in a glass vase.
• Several irises bloomed early because of the mild spring.
• The photographer focused on the subject's strikingly pale irises.
• The nursery sells dozens of iris varieties, all classified by their irises' coloring.
• Researchers measured slight variations between the two irides during the exam.
• The bouquet combined irises with white lilies.
• Wild irises grew along the edge of the marsh.
• The exhibit featured close-up photographs of human irises.
• The greenhouse specialized in rare varieties of irises.
• Doctors compared scans of both irises for early symptoms.
• The florist arranged the irises alongside white tulips.
• The botanist catalogued dozens of iris hybrids for the show.
• Morning light caught the color of her pale irises.
• The gardener divided the irises every few years.
• The exhibit traced how painters have depicted irises for centuries.
• She embroidered irises along the hem of the dress.
• She pressed the irises between the pages of a book.
• The greenhouse rotated its iris displays each season.
• The florist restocked irises for the spring wedding season.
• The competition awarded prizes for the best irises.