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<p><hw>\'d8Xiph`o*su"ra</hw> <pr>(?)</pr>, <pos>n. pl.</pos> <def>See <er>Xiphura</er>.</def><br/
[<source>1913 Webster</source>]</p>
<p><hw>\'d8Xi*phu"ra</hw> <pr>(?)</pr>, <pos>n. pl.</pos> <ety>[NL., from Gr. <grk>xi`fos</grk> sword + <?/ tail.]</ety> <fld>(Zo\'94l.)</fld> <def>Same as <er>Limuloidea</er>. Called also <altname>Xiphosura</altname>.</def><br/
[<source>1913 Webster</source>]</p>
-<p><hw>XP</hw> <pr>(?)</pr>. <ety>[Belongs here in appearance only.]</ety> <def>The first two letters of the Greek word <grk>XRISTOS</grk>, Christ; -- an abbreviation used with the letters separate or, oftener, in a monogram, often inclosed in a circle, as a symbol or emblem of Christ. It use as an emblem was introduced by Constantine the Great, whence it is known as the <col><b>Constantinian symbol</b></col>, or <col><b>monogram</b></col>. See <er>Labarum</er>.</def><br/
+<p><hw>XP</hw> <pr>(?)</pr>. <ety>[Belongs here in appearance only.]</ety> <def>The first two letters of the Greek word <grk>CHRISTOS</grk>, Christ; -- an abbreviation used with the letters separate or, oftener, in a monogram, often inclosed in a circle, as a symbol or emblem of Christ. It use as an emblem was introduced by Constantine the Great, whence it is known as the <col><b>Constantinian symbol</b></col>, or <col><b>monogram</b></col>. See <er>Labarum</er>.</def><br/
[<source>Webster 1913 Suppl.</source>]</p>
<p><hw>x"-rat`ed</hw> <pr>(<ecr/ks"r<amac/t`<ecr/d)</pr>, <pos>a.</pos> <ety>[from a system of ratings for movies based on objectionableness of the content or suitability for children.]</ety> <def>having a rating of X; not suitable for children; broadly, obscene or sexually explicit.</def><br/
[<source>PJC</source>]</p>
<p><mhw><hw>X ray</hw>, <hw>X-ray</hw></mhw> <pr>(<ecr/ks"r<amac/`)</pr>, <pos>n.</pos> <ety>[so called by its discoverer because of its enigmatical character, <it>x</it> being an algebraic symbol for an unknown quantity.]</ety> <fld>(Physics)</fld> <def>originally, any of the rays produced when cathode rays strike upon surface of a solid (as a copper target or the wall of the vacuum tube); now defined as electromagnetic radiation with a wavelength of 0.1 to 10 nanometers. X-rays are noted for their penetration of many opaque substances, as wood and flesh, their action on photographic plates, and their fluorescent effects. They were called <altname>X rays</altname> by their discoverer, <person>W. K. R\'94ntgen</person>, but were also referred to for some time as <altname>Roentgen rays</altname>. The term <ex>X-ray</ex> has become the most common designation. They also ionize gases, but cannot be reflected, or polarized, or deflected by a magnetic field. They are used in examining objects opaque to visible light, as for imaging bones or other structures inside the human body, and for detecting flaws in metal objects, such as in welds.</def><br/

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