Part 3946

<h1>Etesian</h1> <Xpage=512>

<hw>E*te"sian</hw> <tt>(?)</tt>, <tt>a.</tt> <ety>[L. <ets>etesiae</ets>, pl., periodic winds, Gr. <?/, fr. <?/ year: cf. F. <ets>\'82t\'82sien</ets>.]</ety> <def>Periodical; annual; -- applied to winds which annually blow from the north over the Mediterranean, esp. the eastern part, for an irregular period during July and August.</def>

<h1>Ethal</h1> <Xpage=512>

<hw>Eth"al</hw> <tt>(?)</tt>, <tt>n.</tt> <ety>[<ets>Eth</ets>er + <ets>al</ets>cohol: cf. F. <ets>\'82thal</ets>.]</ety> <fld>(Chem.)</fld> <def>A white waxy solid, <chform>C16H33.OH</chform>; -- called also <altname>cetylic alcohol</altname>. See <cref>Cetylic alcohol</cref>, under <er>Cetylic</er>.</def> <-- usu. called cetyl alcohol. -->

<h1>Ethane</h1> <Xpage=512>

<hw>Eth"ane</hw> <tt>(?)</tt>, <tt>n.</tt> <ety>[From <er>Ether</er>.]</ety> <fld>(Chem.)</fld> <def>A gaseous hydrocarbon, <chform>C2H6</chform>, forming a constituent of ordinary illuminating gas. It is the second member of the paraffin series, and its most important derivatives are common alcohol, aldehyde, ether, and acetic acid. Called also <altname>dimethyl</altname>.</def>

<h1>Ethe</h1> <Xpage=512>

<hw>Ethe</hw> <tt>(?)</tt>, <tt>a.</tt> <ety>[See <er>Eath</er>.]</ety> <def>Easy.</def> <mark>[Obs.]</mark>

<i>Spenser.</i>

<h1>Ethel</h1> <Xpage=512>

<hw>Eth"el</hw> <tt>(?)</tt>, <tt>a.</tt> <ety>[AS. <ets>e<?/ele</ets>, <ets>\'91<?/ele</ets>. See <er>Atheling</er>.]</ety> <def>Noble.</def> <mark>[Obs.]</mark>

<h1>Ethene</h1> <Xpage=512>

<hw>Eth"ene</hw> <tt>(?)</tt>, <tt>n.</tt> <fld>(Chem.)</fld> <def>Ethylene; olefiant gas.</def>

<h1>Ethenic</h1> <Xpage=512>

<hw>E*then"ic</hw> <tt>(?)</tt>, <tt>a.</tt> <fld>(Chem.)</fld> <def>Pertaining to, derived from. or resembling, ethene or ethylene; <as>as, <ex>ethenic</ex> ether</as>.</def>

<h1>Ethenyl</h1> <Xpage=512>

<hw>Eth"e*nyl</hw> <tt>(?)</tt>, <tt>n.</tt> <ety>[<ets>Ethene</ets> + <ets>-yl</ets>.]</ety> <fld>(Chem.)</fld> <sd>(a)</sd> <def>A trivalent hydrocarbon radical, <chform>CH3.C</chform>.</def> <sd>(b)</sd> <def>A univalent hydrocarbon radical of the ethylene series, <chform>CH2:CH</chform>; -- called also <altname>vinyl</altname></def>. See <er>Vinyl</er>.</def>

<h1>Etheostomoid</h1> <Xpage=512>

<hw>E`the*os"to*moid</hw> <tt>(?)</tt>, <tt>a.</tt> <ety>[NL. <ets>etheostoma</ets> name of a genus + <ets>-oid</ets>.]</ety> <fld>(Zo\'94l.)</fld> <def>Pertaining to, or like, the genus <spn>Etheostoma</spn>.</def> -- <def2><tt>n.</tt> <def>Any fish of the genus <spn>Etheostoma</spn> and related genera, allied to the perches; -- also called <altname>darter</altname>. The etheostomoids are small and often bright-colored fishes inhabiting the fresh waters of North America. About seventy species are known. See <er>Darter</er>.</def></def2> <-- e.g. the snail darter. -->

<h1>Ether</h1> <Xpage=512>

<hw>E"ther</hw> <tt>(?)</tt>, <tt>n.</tt> <ety>[L. <ets>aether</ets>, Gr. <?/, fr. <?/ to light up, kindle, burn, blaze; akin to Skr. <ets>idh</ets>, <ets>indh</ets>, and prob. to E. <ets>idle</ets>: cf. F. <ets>\'82ther</ets>.]</ety> <def</def>><altsp>[Written also <asp>\'91ther</asp>.]</altsp>

<p><b>1.</b> <fld>(Physics)</fld> <def>A medium of great elasticity and extreme tenuity, supposed to pervade all space, the interior of solid bodies not excepted, and to be the medium of transmission of light and heat; hence often called <i>luminiferous ether</i>.</def>

<p><b>2.</b> <def>Supposed matter above the air; the air itself.</def>

<p><b>3.</b> <fld>(Chem.)</fld> <sd>(a)</sd> <def>A light, volatile, mobile, inflammable liquid, <chform>(C2H5)2O</chform>, of a characteristic aromatic odor, obtained by the distillation of alcohol with sulphuric acid, and hence called also <altname>sulphuric ether</altname>. It is powerful solvent of fats, resins, and pyroxylin, but finds its chief use as an an\'91sthetic. Called also <altname>ethyl oxide</altname>.</def><-- also commonly, <altname>ethyl ether</altname>. --> <sd>(b)</sd> <def>Any similar oxide of hydrocarbon radicals; <as>as, amyl <ex>ether</ex>; valeric <ex>ether</ex>.</as></def>

<cs><mcol><col>Complex ether</col>, <col>Mixed ether</col></mcol> <fld>(Chem.)</fld>, <cd>an oxide of two different radicals in the same molecule; as, ethyl methyl ether, <chform>C2H5.O.CH3</chform>.</cd> -- <col>Compound ether</col> <fld>(Chem.)</fld>, <cd>an ethereal salt or a salt of some hydrocarbon as the base; an ester.</cd> -- <col>Ether engine</col> <fld>(Mach.)</fld>, <cd>a condensing engine like a steam engine, but operated by the vapor of ether instead of by steam.</cd></cs>

<h1>Ethereal</h1> <Xpage=512>

<hw>E*the"re*al</hw> <tt>(?)</tt>, <tt>a.</tt>

<p><b>1.</b> <def>Pertaining to the hypothetical upper, purer air, or to the higher regions beyond the earth or beyond the atmosphere; celestial; <as>as, <ex>ethereal</ex> space; <ex>ethereal</ex> regions.</as></def>