Part 6099

<h1>Isoperimetry</h1> <Xpage=792>

<hw>I`so*per*im"e*try</hw> <tt>(?)</tt>, <tt>n.</tt> <fld>(Geom.)</fld> <def>The science of figures having equal perimeters or boundaries.</def>

<h1>Isopiestic</h1> <Xpage=792>

<hw>I`so*pi*es"tic</hw> <tt>(?)</tt>, <tt>a.</tt> <ety>[<ets>Iso-</ets> + Gr. <?/ to press.]</ety> <fld>(Thermodynamics)</fld> <def>Having equal pressure.</def>

<cs><col>Isopiestic lines</col>, <cd>lines showing, in a diagram, the relations of temperature and volume, when the elastic force is constant; -- called also <altname>isobars</altname>.</cd></cs>

<h1>Isopleura</h1> <Xpage=792>

<hw>I`so*pleu"ra</hw> <tt>(?)</tt>, <tt>n. pl.</tt> <ety>[NL. See <er>Iso-</er>, and <er>Pleura</er>.]</ety> <fld>(Zo\'94l.)</fld> <def>A subclass of Gastropoda, in which the body is symmetrical, the right and left sides being equal.</def>

<note>&hand; The intestine terminates at the posterior end of the body, and the gills and circulatory and reproductive organs are paired. It includes the chitons (<spn>Polyplacophora</spn>), together with <spn>Neomenia</spn> and <spn>Ch\'91toderma</spn>, which are wormlike forms without a shell.</note>

<h1>Isopod</h1> <Xpage=792>

<hw>I"so*pod</hw> <tt>(?)</tt>, <tt>a.</tt> <fld>(Zo\'94l.)</fld> <def>Having the legs similar in structure; belonging to the Isopoda.</def> -- <def2><tt>n.</tt> <def>One of the Isopoda.</def></def2>

<h1>Isopoda</h1> <Xpage=792>

<hw>I*sop"o*da</hw> <tt>(?)</tt>, <tt>n. pl.</tt> <ety>[NL. See <er>Iso-</er>, and <er>-poda</er>.]</ety> <fld>(Zo\'94l.)</fld> <def>An order of sessile-eyed Crustacea, usually having seven pairs of legs, which are all similar in structure.</def>

<note>&hand; The body is usually depressed, with the abdominal segments short, and often consolidated in part. The branchi\'91 are on the abdominal appendages. The group includes the terrestrial pill bugs and sow bugs, with numerous marine forms. See <er>Arthrostrata</er>, <er>Gribble</er>.</note>

<h1>Isopodiform</h1> <Xpage=792>

<hw>I`so*pod"i*form</hw> <tt>(?)</tt>, <tt>a.</tt> <ety>[<ets>Isopod</ets> + -<ets>form</ets>.]</ety> <fld>(Zo\'94l.)</fld> <def>Having the shape of an isopod; -- said of the larv\'91 of certain insects.</def>

<h1>Isopodous</h1> <Xpage=792>

<hw>I*sop"o*dous</hw> <tt>(?)</tt>, <tt>a.</tt> <def>Same as <er>Isopod</er>.</def>

<h1>Isopogonous</h1> <Xpage=792>

<hw>I`so*pog"o*nous</hw> <tt>(?)</tt>, <tt>a.</tt> <ety>[<ets>Iso-</ets> + Gr. <?/ beard.]</ety> <fld>(Zo\'94l.)</fld> <def>Having the two webs equal in breath; -- said of feathers.</def>

<h1>Isoprene</h1> <Xpage=792>

<hw>I"so*prene</hw> <tt>(?)</tt>, <tt>n.</tt> <ety>[Etymol. uncertain.]</ety> <fld>(Chem.)</fld> <def>An oily, volatile hydrocarbon, obtained by the distillation of caoutchouc or guttaipercha.</def><-- <chform>C5H8</chform> -- unsaturated, and used to make synthetic rubber by polymerization. In organic chemistry, viewed conceptually as the building block of the terpene series of hydrocarbons -->

<h1>Isopycnic</h1> <Xpage=792>

<hw>I`so*pyc"nic</hw> <tt>(?)</tt>, <tt>a.</tt> <ety>[<ets>Iso-</ets> + Gr. <grk>pykno`s</grk> dense.]</ety> <fld>(Physics)</fld> <def>Having equal density, as different regions of a medium; passing through points at which the density is equal; <as>as, an <ex>isopycnic</ex> line or surface</as>.</def>

<h1>Isopycnic</h1> <Xpage=792>

<hw>I`so*pyc"nic</hw>, <tt>n.</tt> <fld>(Physics)</fld> <def>A line or surface passing through those points in a medium, at which the density is the same.</def>

<h1>Isorcin</h1> <Xpage=792>

<hw>I*sor"cin</hw> <tt>(?)</tt>, <tt>n.</tt> <ety>[<ets>Iso-</ets> + <ets>orcin</ets>.]</ety> <fld>(Chem.)</fld> <def>A crystalline hydrocarbon derivative, metameric with orcin, but produced artificially; -- called also <altname>cresorcin</altname>.</def>

<h1>Isorropic</h1> <Xpage=792>