Part 3059

<h1>Diacoustics</h1> <Xpage=405>

<hw>Di`a*cous"tics</hw> <tt>(?)</tt>, <tt>n.</tt> <ety>[Cf. F. <ets>diacoustique</ets>.]</ety> <def>That branch of natural philosophy which treats of the properties of sound as affected by passing through different mediums; -- called also <altname>diaphonics</altname>. See the Note under <er>Acoustics</er>.</def>

<h1>Diacritic, Diacritical</h1> <Xpage=405>

<hw><hw>Di`a*crit"ic</hw> <tt>(?)</tt>, <hw>Di`a*crit"ic*al</hw> <tt>(?)</tt>,<hw> <tt>a.</tt> <ety>[Gr. <?/, fr. <?/ to separate, distinguish; <?/ through + <?/ to separate. See <er>Critic</er>.]</ety> <def>That separates or distinguishes; -- applied to points or marks used to distinguish letters of similar form, or different sounds of the same letter, as, \'be, &acr;, \'84, &omac;, &ocr;, etc.</def> "<i>Diacritical</i> points."

<i>Sir W. Jones.</i>

<blockquote>A glance at this typography will reveal great difficulties, which <b>diacritical</b> marks necessarily throw in the way of both printer and writer. <i>A. J. Ellis.</i></blockquote>

<h1>Diactinic</h1> <Xpage=405>

<hw>Di`ac*tin"ic</hw> <tt>(?)</tt>, <tt>a.</tt> <ety>[Pref. <ets>di-</ets> + <ets>actinic</ets>.]</ety> <fld>(Physics)</fld> <def>Capable of transmitting the chemical or actinic rays of light; <as>as, <ex>diactinic</ex> media</as>.</def>

<h1>Diadelphia</h1> <Xpage=405>

<hw>Di`a*del"phi*a</hw> <tt>(?)</tt>, <tt>n.</tt>; <plu>pl</plu>. <ety>[NL., fr. Gr. <?/ = <?/ twice + <?/ brother.]</ety> <fld>(Bot.)</fld> <def>A Linn\'91an class of plants whose stamens are united into two bodies or bundles by their filaments.</def>

<h1>Diadelphian, Diadelphous</h1> <Xpage=405>

<hw><hw>Di`a*del"phi*an</hw> <tt>(?)</tt>, <hw>Di`a*del"phous</hw> <tt>(?)</tt>,<hw> <tt>a.</tt> <ety>[Cf. F. <ets>diadelphe</ets>.]</ety> <fld>(Bot.)</fld> <def>Of or pertaining to the class Diadelphia; having the stamens united into two bodies by their filaments (said of a plant or flower); grouped into two bundles or sets by coalescence of the filaments (said of stamens).</def>

<h1>Diadem</h1> <Xpage=405>

<hw>Di"a*dem</hw> <tt>(?)</tt>, <tt>n.</tt> <ety>[F. <ets>diad\'8ame</ets>, L. <ets>diadema</ets>, fr. Gr. <?/, fr. <?/ to bind round; <?/ through, across + <?/ to bind; cf. Skr. <ets>d\'be</ets> to bind.]</ety>

<p><b>1.</b> <def>Originally, an ornamental head band or fillet, worn by Eastern monarchs as a badge of royalty; hence (later), also, a crown, in general.</def> "The regal <i>diadem</i>."

<i>Milton.</i>

<p><b>2.</b> <def>Regal power; sovereignty; empire; -- considered as symbolized by the crown.</def>

<p><b>3.</b> <fld>(Her.)</fld> <def>An arch rising from the rim of a crown (rarely also of a coronet), and uniting with others over its center.</def>

<cs><col>Diadem lemur</col>. <fld>(Zo\'94l.)</fld> <cd>See <er>Indri</er>.</cd> -- <col>Diadem spider</col> <fld>(Zo\'94l.)</fld>, <cd>the garden spider.</cd></cs>

<h1>Diadem</h1> <Xpage=405>

<hw>Di"a*dem</hw>, <tt>v. t.</tt> <def>To adorn with a diadem; to crown.</def>

<blockquote>Not so, when <b>diadem'd</b> with rays divine. <i>Pope.</i></blockquote>

<blockquote>To terminate the evil, To <b>diadem</b> the right. <i>R. H. Neale.</i></blockquote>

<h1>Diadrom</h1> <Xpage=405>

<hw>Di"a*drom</hw> <tt>(?)</tt>, <tt>n.</tt> <ety>[Gr. <?/ a running through; <?/ through + <?/, used as inf. aor. of <?/ to run.]</ety> <def>A complete course or vibration; time of vibration, as of a pendulum.</def> <mark>[Obs.]</mark>

<i>Locke.</i>

<h1>Di\'91resis, Dieresis</h1> <Xpage=405>

<hw><hw>Di*\'91r"e*sis</hw>, <hw>Di*er"e*sis</hw><hw> <tt>(?; 277)</tt>, <tt>n.</tt>; <plu>pl. <plw>Di\'91reses</plw> &or; <plw>Diereses</plw> <tt>(#)</tt></plu>. <ety>[L. <ets>diaeresis</ets>, Gr. <?/, fr. <?/ to divide; <?/ through, asunder + <?/ to take. See <er>Heresy</er>.]</ety>