Part 5213

<h1>Heliolite</h1> <Xpage=682>

<hw>He"li*o*lite</hw> <tt>(?)</tt>, <tt>n.</tt> <ety>[<ets>Helio-</ets> + <ets>-lite</ets>.]</ety> <fld>(Paleon.)</fld> <def>A fossil coral of the genus <spn>Heliolites</spn>, having twelve-rayed cells. It is found in the Silurian rocks.</def>

<h1>Heliometer</h1> <Xpage=682>

<hw>He`li*om"e*ter</hw> <tt>(?)</tt>, <tt>n.</tt> <ety>[<ets>Helio-</ets> + <ets>-meter</ets>: cf. F. <ets>h\'82liom\'8atre</ets>.]</ety> <fld>(Astron.)</fld> <def>An instrument devised originally for measuring the diameter of the sun; now employed for delicate measurements of the distance and relative direction of two stars too far apart to be easily measured in the field of view of an ordinary telescope.</def>

<h1>Heliometric, Heliometrical</h1> <Xpage=682>

<hw><hw>He`li*o*met"ric</hw> <tt>(?)</tt>, <hw>He`li*o*met"ric*al</hw> <tt>(?)</tt>,<hw> <tt>a.</tt> <def>Of or pertaining to the heliometer, or to heliometry.</def>

<h1>Heliometry</h1> <Xpage=682>

<hw>He`li*om"e*try</hw> <tt>(?)</tt>, <tt>n.</tt> <def>The apart or practice of measuring the diameters of heavenly bodies, their relative distances, etc. See <er>Heliometer</er>.</def>

<h1>Heliopora</h1> <Xpage=682>

<hw>He`li*op"o*ra</hw> <tt>(?)</tt>, <tt>n.</tt> <ety>[NL., fr. Gr. <?/ the sun + <?/ a passage, pore.]</ety> <fld>(Zo\'94l.)</fld> <def>An East Indian stony coral now known to belong to the Alcyonaria; -- called also <altname>blue coral</altname>.</def>

<h1>Helioscope</h1> <Xpage=682>

<hw>He"li*o*scope</hw> <tt>(?)</tt>, <tt>n.</tt> <ety>[<ets>Helio-</ets> + <ets>-scope</ets>: cf. F. <ets>h\'82lioscope</ets>.]</ety> <fld>(Astron.)</fld> <def>A telescope or instrument for viewing the sun without injury to the eyes, as through colored glasses, or with mirrors which reflect but a small portion of light.</def> -- <wordforms><wf>He`li*o*scop`ic</wf> <tt>(#)</tt>, <tt>a.</tt></wordforms>

<h1>Heliostat</h1> <Xpage=682>

<hw>He"li*o*stat</hw> <tt>(?)</tt>, <tt>n.</tt> <ety>[<ets>Helio-</ets> + Gr. <?/ placed, standing, fr. <?/ to place, stand: cf. F. <ets>h\'82liostate</ets>.]</ety> <def>An instrument consisting of a mirror moved by clockwork, by which a sunbeam is made apparently stationary, by being steadily directed to one spot during the whole of its diurnal period; also, a geodetic heliotrope.</def>

<h1>Heliotrope</h1> <Xpage=682>

<hw>He"li*o*trope</hw> <tt>(?)</tt>, <tt>n.</tt> <ety>[F. <ets>h\'82liotrope</ets>, L. <ets>heliotropium</ets>, Gr. <?/; <?/ the sun + <?/ to turn, <?/ turn. See <er>Heliacal</er>, <er>Trope</er>.]</ety> <p><b>1.</b> <fld>(Anc. Astron.)</fld> <def>An instrument or machine for showing when the sun arrived at the tropics and equinoctial line.</def>

<p><b>2.</b> <fld>(Bot.)</fld> <def>A plant of the genus <spn>Heliotropium</spn>; -- called also <altname>turnsole</altname> and <altname>girasole</altname>. <spn>H. Peruvianum</spn> is the commonly cultivated species with fragrant flowers.</def>

<p><b>3.</b> <fld>(Geodesy & Signal Service)</fld> <def>An instrument for making signals to an observer at a distance, by means of the sun's rays thrown from a mirror.</def>

<p><b>4.</b> <fld>(Min.)</fld> <def>See <er>Bloodstone</er> <sd>(a)</sd>.</def>

<cs><col>Heliotrope purple</col>, <cd>a grayish purple color.</cd></cs>

<h1>Heliotroper</h1> <Xpage=682>

<hw>He"li*o*tro`per</hw> <tt>(?)</tt>, <tt>n.</tt> <def>The person at a geodetic station who has charge of the heliotrope.</def>

<h1>Heliotropic</h1> <Xpage=682>

<hw>He`li*o*trop"ic</hw> <tt>(?)</tt>, <tt>a.</tt> <fld>(Bot.)</fld> <def>Manifesting heliotropism; turning toward the sun.</def>

<h1>Heliotropism</h1> <Xpage=682>

<hw>He`li*ot"ro*pism</hw> <tt>(?)</tt>, <tt>n.</tt> <ety>[<ets>Helio-</ets> + Gr. <?/ to turn.]</ety> <fld>(Bot.)</fld> <def>The phenomenon of turning toward the light, seen in many leaves and flowers.</def>

<h1>Heliotype</h1> <Xpage=682>

<hw>He"li*o*type</hw> <tt>(?)</tt>, <tt>n.</tt> <ety>[<ets>Helio-</ets> + <ets>-type</ets>.]</ety> <def>A picture obtained by the process of heliotypy.</def>