iris | | |
n. (plant) | 1. flag, fleur-de-lis, iris, sword lily | plants with sword-shaped leaves and erect stalks bearing bright-colored flowers composed of three petals and three drooping sepals. |
| ~ iridaceous plant | any bulbous plant of the family Iridaceae. |
| ~ genus iris | large genus of perennials that develop from bulbs or rhizomes. |
| ~ bearded iris | any of numerous wild or cultivated irises with hairlike structures on the falls (the drooping sepals). |
| ~ beardless iris | any of numerous wild or cultivated irises having no hairs on the drooping sepals (the falls). |
| ~ bulbous iris | any of various irises having a rootstock formed like a bulb. |
| ~ iris cristata, dwarf iris | low-growing summer-flowering iris of northeastern United States. |
| ~ gladdon, gladdon iris, iris foetidissima, roast beef plant, stinking gladwyn, stinking iris | iris with purple flowers and foul-smelling leaves; southern and western Europe and North Africa. |
| ~ iris persica, persian iris | bulbous iris native to Asia Minor cultivated for its pale lilac-colored flowers. |
| ~ iris pseudacorus, yellow flag, yellow iris, yellow water flag | common yellow-flowered iris of Europe and North Africa, naturalized in United States and often cultivated. |
| ~ dwarf iris, iris verna, vernal iris | low-growing spring-flowering American iris with bright blue-lilac flowers. |
| ~ blue flag, iris versicolor | a common iris of the eastern United States having blue or blue-violet flowers; root formerly used medicinally. |
| ~ iris virginica, southern blue flag | similar to blue flag; the eastern United States. |
| ~ english iris, iris xiphioides | bulbous iris native to the Pyrenees; widely cultivated for its large delicate flowers in various colors except yellow. |
n. (body) | 2. iris | 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. |
| ~ eye, oculus, optic | the organ of sight. |
| ~ pupil | the contractile aperture in the center of the iris of the eye; resembles a large black dot. |
| ~ tissue layer, membrane | a pliable sheet of tissue that covers or lines or connects the organs or cells of animals or plants. |
n. (artifact) | 3. iris, iris diaphragm | diaphragm consisting of thin overlapping plates that can be adjusted to change the diameter of a central opening. |
| ~ diaphragm, stop | a mechanical device in a camera that controls size of aperture of the lens.; "the new cameras adjust the diaphragm automatically" |
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