| enchiridion | (noun) a concise reference book providing specific information about a subject or location | Synonyms: handbook, vade mecum |
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| iridectomy | (noun) an eye operation that treats closed-angle glaucoma by surgical removal of part of the iris of the eye | - |
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| iridescence | (noun) the visual property of something having a milky brightness and a play of colors from the surface | Synonyms: opalescence |
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| iridium | (noun) a heavy brittle metallic element of the platinum group; used in alloys; occurs in natural alloys with platinum or osmium | Synonyms: atomic number 77, Ir |
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| iridocyclitis | (noun) inflammation of the iris and ciliary body of the eye | - |
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| iridokeratitis | (noun) inflammation of the iris and cornea of the eye | - |
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| iridoncus | (noun) swelling of the iris of the eye | - |
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| iridosmine | (noun) a hard and corrosion resistant mineral that is a natural alloy of osmium and iridium (usually containing small amounts of rhodium and platinum); used in needles and pen nibs etc. | Synonyms: osmiridium |
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| iridotomy | (noun) a surgical procedure that makes an incision in the iris of the eye in order to enlarge the pupil or to treat closed-angle glaucoma | - |
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| mirid | (noun) a variety of leaf bug | Synonyms: capsid, mirid bug |
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| osmiridium | (noun) a hard and corrosion resistant mineral that is a natural alloy of osmium and iridium (usually containing small amounts of rhodium and platinum); used in needles and pen nibs etc. | Synonyms: iridosmine |
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| viridity | (noun) green color or pigment; resembling the color of growing grass | Synonyms: green, greenness |
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