Part 6097

<h1>Isolatedly</h1> <Xpage=791>

<hw>I"so*la`ted*ly</hw> <tt>(?)</tt>, <tt>adv.</tt> <def>In an isolated manner.</def>

<h1>Isolation</h1> <Xpage=791>

<hw>I`so*la"tion</hw> <tt>(?)</tt>, <tt>n.</tt> <ety>[Cf. F. <ets>isolation</ets>.]</ety> <def>The act of isolating, or the state of being isolated; insulation; separation; loneliness.</def>

<i>Milman.</i>

<hr> <page="792"> Page 792<p>

<h1>Isolator</h1> <Xpage=792>

<hw>I"so*la`tor</hw> <tt>(?)</tt>, <tt>n.</tt> <def>One who, or that which, isolates.</def>

<h1>Isologous</h1> <Xpage=792>

<hw>I*sol"o*gous</hw> <tt>(?)</tt>, <tt>a.</tt> <ety>[<ets>Iso-</ets> + Gr. <?/ proportion.]</ety> <fld>(Chem.)</fld> <def>Having similar proportions, similar relations, or similar differences of composition; -- said specifically of groups or series which differ by a constant difference; <as>as, ethane, ethylene, an acetylene, or their analogous compounds, form an <ex>isologous</ex> series</as>.</def>

<h1>Isomer</h1> <Xpage=792>

<hw>I"so*mer</hw>, <tt>n.</tt> <ety>[See <er>Isomeric</er>.]</ety> <fld>(Chem.)</fld> <def>A body or compound which is isomeric with another body or compound; a member of an isomeric series.</def>

<h1>Isomeric</h1> <Xpage=792>

<hw>I`so*mer"ic</hw> <tt>(?)</tt>, <tt>a.</tt> <ety>[<ets>Iso-</ets> + Gr. <?/ part: cf. F. <ets>isom\'82rique</ets>.]</ety> <fld>(Chem.)</fld> <def>Having the same percentage composition; -- said of two or more different substances which contain the same ingredients in the same proportions by weight, often used with <i>with</i>. Specif.: <sd>(a)</sd> Polymeric; <it>i. e.</it>, having the same elements united in the same proportion by weight, but with different molecular weights; <as>as, acetylene and benzine are <ex>isomeric</ex> (<ex>polymeric</ex>) with each other in this sense</as>. See <er>Polymeric</er>. <sd>(b)</sd> Metameric; <it>i. e.</it>, having the same elements united in the same proportions by weight, and with the same molecular weight, but which a different structure or arrangement of the ultimate parts; <as>as, ethyl alcohol and methyl ether are <ex>isomeric</ex> (<ex>metameric</ex>) with each other in this sense</as>. See <er>Metameric</er>.</def>

<h1>Isomeride</h1> <Xpage=792>

<hw>I*som"er*ide</hw> <tt>(?)</tt>, <tt>n.</tt> <fld>(Chem.)</fld> <def>An isomer.</def> <mark>[R.]</mark>

<h1>Isomerism</h1> <Xpage=792>

<hw>I*som"er*ism</hw> <tt>(?)</tt>, <tt>n.</tt> <fld>(Chem.)</fld> <def>The state, quality, or relation, of two or more isomeric substances.</def>

<cs><col>Physical isomerism</col> <fld>(Chem.)</fld>, <cd>the condition or relation of certain (<it>metameric<it>) substances, which, while chemically identical (in that they have the same composition, the same molecular weights, and the same ultimate constitution), are yet physically different, as in their action on polarized light, as dextro- and l\'91vo-tartaric acids. In such compounds there is usually at least one unsymmetrical carbon atom. See <er>Unsymmetrical</er>.</cd></cs><-- "metamerism" is no longer used, and "isomerism" is generally applied to this conept. including optical isomerism, the property of optical isomers -->

<h1>Isomeromorphism</h1> <Xpage=792>

<hw>I`so*mer`o*mor"phism</hw> <tt>(?)</tt>, <tt>n.</tt> <ety>[<ets>Isomer</ets> + Gr. <?/ form + -<ets>ism</ets>.]</ety> <fld>(Crystallog.)</fld> <def>Isomorphism between substances that are isomeric.</def>

<h1>Isometric, Isometrical</h1> <Xpage=792>

<hw><hw>I`so*met"ric</hw> <tt>(?)</tt>, <hw>I`so*met"ric*al</hw> <tt>(?)</tt>,<hw> <tt>a.</tt> <ety>[<ets>Iso-</ets> + Gr. <?/ measure.]</ety>

<p><b>1.</b> <def>Pertaining to, or characterized by, equality of measure.</def>

<p><b>2.</b> <fld>(Crystallog.)</fld> <def>Noting, or conforming to, that system of crystallization in which the three axes are of equal length and at right angles to each other; monometric; regular; cubic. Cf. <er>Crystallization</er>.</def>

<cs><col>Isometric lines</col> <fld>(Thermodynamics)</fld>, <cd>lines representing in a diagram the relations of pressure and temperature in a gas, when the volume remains constant.</cd> -- <col>Isometrical perspective</col>. <cd>See under <er>Perspective</er>.</cd> -- <col>Isometrical projection</col>, <cd>a species of orthographic projection, in which but a single plane of projection is used. It is so named from the fact that the projections of three equal lines, parallel respectively to three rectangular axes, are equal to one another. This kind of projection is principally used in delineating buildings or machinery, in which the principal lines are parallel to three rectangular axes, and the principal planes are parallel to three rectangular planes passing through the three axes.</cd></cs>

<h1>Isomorph</h1> <Xpage=792>

<hw>I"so*morph</hw> <tt>(?)</tt>, <tt>n.</tt> <ety>[See <er>Isomorphous</er>.]</ety> <def>A substance which is similar to another in crystalline form and composition.</def>