Part 3067

<h1>Diameter</h1> <Xpage=406>

<hw>Di*am"e*ter</hw> <tt>(?)</tt>, <tt>n.</tt> <ety>[F. <ets>diam\'8atre</ets>, L. <ets>diametros</ets>, fr. Gr. <?/; <?/ through + <?/ measure. See <er>Meter</er>.]</ety>

<p><b>1.</b> <fld>(Geom.)</fld> <sd>(a)</sd> <def>Any right line passing through the center of a figure or body, as a circle, conic section, sphere, cube, etc., and terminated by the opposite boundaries; a straight line which bisects a system of parallel chords drawn in a curve.</def> <sd>(b)</sd> <def>A diametral plane.</def>

<p><b>2.</b> <def>The length of a straight line through the center of an object from side to side; width; thickness; <as>as, the <ex>diameter</ex> of a tree or rock</as>.</def>

<note>&hand; In an elongated object the diameter is usually taken at right angles to the longer axis.</note>

<p><b>3.</b> <fld>(Arch.)</fld> <def>The distance through the lower part of the shaft of a column, used as a standard measure for all parts of the order. See <er>Module</er>.</def>

<cs><col>Conjugate diameters</col>. <cd>See under <er>Conjugate</er>.</cd></cs>

<h1>Diametral</h1> <Xpage=406>

<hw>Di*am"e*tral</hw> <tt>(?)</tt>, <tt>a.</tt> <ety>[Gr. F. <ets>diam\'82tral</ets>.]</ety> <def>Pertaining to a diameter; diametrical.</def>

<cs><mcol><col>Diametral curve</col>, <col>Diametral surface</col></mcol> <fld>(Geom.)</fld>, <cd>any line or surface which bisects a system of parallel chords drawn in a curve or surface.</cd> -- <col>Diametral planes</col> <fld>(Crystal.)</fld>, <cd>planes in which two of the axes lie.</cd></cs>

<h1>Diametral</h1> <Xpage=406>

<hw>Di*am"e*tral</hw>, <tt>n.</tt> <def>A diameter.</def> <mark>[Obs.]</mark>

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

<h1>Diametrally</h1> <Xpage=406>

<hw>Di*am"e*tral*ly</hw>, <tt>adv.</tt> <def>Diametrically.</def>

<h1>Diametric, Diametrical</h1> <Xpage=406>

<hw><hw>Di*am"e*tric</hw> <tt>(?)</tt>, <hw>Di*am"e*tric*al</hw> <tt>(?)</tt>,<hw> <tt>a.</tt>

<p><b>1.</b> <def>Of or pertaining to a diameter.</def>

<p><b>2.</b> <def>As remote as possible, as if at the opposite end of a diameter; directly adverse.</def>

<h1>Diametrically</h1> <Xpage=406>

<hw>Di*am"e*tric*al*ly</hw>, <tt>adv.</tt> <def>In a diametrical manner; directly; <as>as, <ex>diametrically</ex> opposite</as>.</def>

<blockquote>Whose principles were <b>diametrically</b> opposed to his. <i>Macaulay.</i></blockquote>

<h1>Diamide</h1> <Xpage=406>

<hw>Di*am"ide</hw> <tt>(?; 104)</tt>, <tt>n.</tt> <ety>[Pref. <ets>di-</ets> + <ets>amide</ets>.]</ety> <fld>(Chem.)</fld> <def>Any compound containing two amido groups united with one or more acid or negative radicals, -- as distinguished from a diamine. Cf. <i>Amido acid</i>, under <er>Amido</er>, and <i>Acid amide</i>, under <er>Amide</er>.</def>

<h1>Diamido-</h1> <Xpage=406>

<hw>Di*am"i*do-</hw> <tt>(<?/)</tt>, <tt>a.</tt> <fld>(Chem.)</fld> <def>A prefix or combining form of <er>Diamine</er>. <note>[Also used adjectively.]</note></def>

<h1>Diamine</h1> <Xpage=406>

<hw>Di*am"ine</hw> <tt>(?; 104)</tt>, <tt>n.</tt> <ety>[Pref. <ets>di-</ets> + <ets>amine</ets>.]</ety> <fld>(Chem.)</fld> <def>A compound containing two amido groups united with one or more basic or positive radicals, -- as contrasted with a <i>diamide</i>.</def>