Part 6064

<h1>Iridic</h1> <Xpage=787>

<hw>I*rid"ic</hw>, <tt>a.</tt> <fld>(Chem.)</fld> <def>Of or pertaining to iridium; -- said specifically of those compounds in which iridium has a relatively high valence.</def>

<h1>Iridioscope</h1> <Xpage=787>

<hw>I*rid"i*o*scope</hw> <tt>(?)</tt>, <tt>n.</tt> <ety>[See <er>Iris</er>, and <er>-scope</er>.]</ety> <def>A kind of ophthalmoscope.</def>

<h1>Iridious</h1> <Xpage=787>

<hw>I*rid"i*ous</hw> <tt>(?)</tt>, <tt>a.</tt> <fld>(Chem.)</fld> <def>Of or pertaining to iridium; -- applied specifically to compounds in which iridium has a low valence.</def>

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<h1>Iridium</h1> <Xpage=788>

<hw>I*rid"i*um</hw> <tt>(?)</tt>, <tt>n.</tt> <ety>[NL., fr. L. <ets>iris</ets>, <ets>iridis</ets>, the rainbow. So called from the iridescence of some of its solutions. See <er>Iris</er>.]</ety> <fld>(Chem.)</fld> <def>A rare metallic element, of the same group as platinum, which it much resembles, being silver-white, but harder, and brittle, and indifferent to most corrosive agents. With the exception of osmium, it is the heaviest substance known, its specific gravity being 22.4. Symbol Ir. Atomic weight 192.5.</def>

<note>&hand; Iridium usually occurs as a native alloy with osmium (<i>iridosmine</i> or <i>osmiridium</i>), which may occur alone or with platinum. Iridium, as an alloy with platinum, is used in bushing the vents of heavy ordnance. It is also used for the points of gold pens, and in a finely powdered condition (<i>iridium black</i>), for painting porcelain black.</note>

<h1>Iridize</h1> <Xpage=788>

<hw>Ir"i*dize</hw> <tt>(?)</tt>, <tt>v. t.</tt> <wordforms>[<tt>imp. & p. p.</tt> <er>Iridized</er> <tt>(?)</tt>; <tt>p. pr. & vb. n.</tt> <er>Iridizing</er> <tt>(?)</tt>.]</wordforms>

<p><b>1.</b> <def>To point or tip with iridium, as a gold pen.</def>

<p><b>2.</b> <def>To make iridescent; <as>as, to <ex>iridize</ex> glass</as>.</def>

<h1>Iridoline</h1> <Xpage=788>

<hw>I*rid"o*line</hw> <tt>(?)</tt>, <tt>n.</tt> <ety>[<ets>Irid</ets>escent + L. <ets>ol</ets>eum oil.]</ety> <fld>(Chem.)</fld> <def>A nitrogenous base <chform>C10H9N</chform>, extracted from coal-tar naphtha, as an oily liquid. It is a member of the quinoline series, and is probably identical with <altname>lepidine</altname>.</def>

<h1>Iridosmine, Iridosmium</h1> <Xpage=788>

<hw><hw>Ir`i*dos"mine</hw> <tt>(?)</tt>, <hw>Ir`i*dos"mi*um</hw> <tt>(?)</tt>,<hw> <tt>n.</tt> <ety>[<ets>Irid</ets>ium + <ets>osmium</ets>.]</ety> <fld>(Min.)</fld> <def>The native compound of iridium and osmium. It is found in flattened metallic grains of extreme hardness, and is often used for pointing gold pens.</def>

<h1>Iris</h1> <Xpage=788>

<hw>I"ris</hw> <tt>(?)</tt>, <tt>n.</tt>; <plu>pl. E. <plw>Irises</plw> <tt>(#)</tt>, L. <plw>Irides</plw> <tt>(#)</tt></plu>. <ety>[L. <ets>iris</ets>, <ets>iridis</ets>, the goddess, Gr. <?/, <?/, the rainbow, iris of the eye, the plant Iris. Cf. <er>Orris</er>.]</ety>

<p><b>1.</b> <fld>(Class. Myth.)</fld> <def>The goddess of the rainbow, and swift-footed messenger of the gods.</def>

<i>Shak.</i>

<p><b>2.</b> <def>The rainbow.</def>

<i>Sir T. Browne.</i>

<p><b>3.</b> <def>An appearance resembling the rainbow; a prismatic play of colors.</def>

<i>Tennyson.</i>

<p><b>4.</b> <fld>(Anat.)</fld> <def>The contractile membrane perforated by the pupil, and forming the colored portion of the eye. See <er>Eye</er>.</def>

<p><b>5.</b> <fld>(Bot.)</fld> <def>A genus of plants having showy flowers and bulbous or tuberous roots, of which the flower-de-luce (<i>fleur-de-lis</i>), orris, and other species of flag are examples. See <i>Illust</i>. of <er>Flower-de-luce</er>.</def>