Part 5211

<hw>He*lic"i*form</hw> <tt>(?)</tt>, <tt>a.</tt> <ety>[<ets>Helix</ets> + <ets>-form</ets>.]</ety> <def>Having the form of a helix; spiral.</def>

<h1>Helicin</h1> <Xpage=682>

<hw>Hel"i*cin</hw> <tt>(?)</tt>, <tt>n.</tt> <fld>(Chem.)</fld> <def>A glucoside obtained as a white crystalline substance by partial oxidation of salicin, from a willow (<spn>Salix Helix</spn> of Linn\'91us.)</def>

<h1>Helicine</h1> <Xpage=682>

<hw>Hel"i*cine</hw> <tt>(?)</tt>, <tt>a.</tt> <fld>(Anat.)</fld> <def>Curled; spiral; helicoid; -- applied esp. to certain arteries of the penis.</def>

<h1>Hellicograph</h1> <Xpage=682>

<hw>Hel"li*co*graph`</hw> <tt>(?)</tt>, <tt>n.</tt> <ety>[<ets>Helix</ets> + <ets>-graph</ets>.]</ety> <def>An instrument for drawing spiral lines on a plane.</def>

<h1>Helicoid</h1> <Xpage=682>

<hw>Hel"i*coid</hw> <tt>(?)</tt>, <tt>a.</tt> <ety>[Gr. <?/; <?/, <?/, spiral + <?/ shape: cf. F. <ets>h\'82lico\'8bde</ets>. See <er>Helix</er>.]</ety>

<p><b>1.</b> <def>Spiral; curved, like the spire of a univalve shell.</def>

<p><b>2.</b> <fld>(Zo\'94l.)</fld> <def>Shaped like a snail shell; pertaining to the <spn>Helicid\'91</spn>, or Snail family.</def>

<cs><col>Helicoid parabola</col> <fld>(Math.)</fld>, <cd>the parabolic spiral.</cd></cs>

<h1>Helicoid</h1> <Xpage=682>

<hw>Hel"i*coid</hw>, <tt>n.</tt> <fld>(Geom.)</fld> <def>A warped surface which may be generated by a straight line moving in such a manner that every point of the line shall have a uniform motion in the direction of another fixed straight line, and at the same time a uniform angular motion about it.</def>

<h1>Helicoidal</h1> <Xpage=682>

<hw>Hel`i*coid"al</hw> <tt>(?)</tt>, <tt>a.</tt> <def>Same as <er>Helicoid</er>.</def> -- <wordforms><wf>Hel`i*coid"al*ly</wf>, <tt>adv.</tt></wordforms>

<h1>Helicon</h1> <Xpage=682>

<hw>Hel"i*con</hw> <tt>(?)</tt>, <tt>n.</tt> <ety>[L., fr. Gr. <?/.]</ety> <def>A mountain in B\'d2otia, in Greece, supposed by the Greeks to be the residence of Apollo and the Muses.</def>

<blockquote>From <b>Helicon's</b> harmonious springs A thousand rills their mazy progress take. <i>Gray.</i></blockquote>

<h1>Heliconia</h1> <Xpage=682>

<hw>Hel`i*co"ni*a</hw> <tt>(?)</tt>, <tt>n.</tt> <ety>[NL. See <er>Helicon</er>.]</ety> <fld>(Zo\'94l.)</fld> <def>One of numerous species of <spn>Heliconius</spn>, a genus of tropical American butterflies. The wings are usually black, marked with green, crimson, and white.</def>

<h1>Heliconian</h1> <Xpage=682>

<hw>Hel`i*co"ni*an</hw> <tt>(?)</tt>, <tt>a.</tt> <ety>[L. <ets>Heliconius</ets>.]</ety> <p><b>1.</b> <def>Of or pertaining to Helicon.</def> "<i>Heliconian</i> honey."

<i>Tennyson.</i>

<p><b>2.</b> <fld>(Zo\'94l.)</fld> <def>Like or pertaining to the butterflies of the genus <spn>Heliconius</spn>.</def>

<h1>Helicotrema</h1> <Xpage=682>

<hw>Hel`i*co"tre"ma</hw> <tt>(?)</tt>, <tt>n.</tt> <ety>[NL., fr. Gr. <?/, <?/, a helix + <?/ a hole.]</ety> <fld>(Anat.)</fld> <def>The opening by which the two scal\'91 communicate at the top of the cochlea of the ear.</def>

<h1>Helio-</h1> <Xpage=682>