Webster's Dictionary, 1913

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Helical adjective [ From Helix .] Of or pertaining to, or in the form of, a helix; spiral; as, a helical staircase; a helical spring. -- Hel"i*cal*ly , adverb

Helichrysum noun [ Latin , the marigold, from Greek ... a kind of plant.] (Botany) A genus of composite plants, with shining, commonly white or yellow, or sometimes reddish, radiated involucres, which are often called "everlasting flowers."

Heliciform adjective [ Helix + -form .] Having the form of a helix; spiral.

Helicin noun (Chemistry) A glucoside obtained as a white crystalline substance by partial oxidation of salicin, from a willow ( Salix Helix of Linnæus.)

Helicine adjective (Anat.) Curled; spiral; helicoid; -- applied esp. to certain arteries of the penis.

Helicograph noun [ Helix + -graph .] An instrument for drawing spiral lines on a plane.

Helicoid adjective [ Greek ...; "e`lix , -ikos , spiral + ... shape: confer French hélicoïde . See Helix .]

1. Spiral; curved, like the spire of a univalve shell.

2. (Zoology) Shaped like a snail shell; pertaining to the Helicidæ , or Snail family.

Helicoid parabola (Math.) , the parabolic spiral.

Helicoid noun (Geom.) 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.

Helicoidal adjective Same as Helicoid . -- Hel`i*coid"al*ly , adverb

Helicon noun [ Latin , from Greek ....] A mountain in Bœotia, in Greece, supposed by the Greeks to be the residence of Apollo and the Muses.

From Helicon's harmonious springs
A thousand rills their mazy progress take.

Heliconia noun [ New Latin See Helicon .] (Zoology) One of numerous species of Heliconius , a genus of tropical American butterflies. The wings are usually black, marked with green, crimson, and white.

Heliconian adjective [ Latin Heliconius .]
1. Of or pertaining to Helicon. " Heliconian honey." Tennyson.

2. (Zoology) Like or pertaining to the butterflies of the genus Heliconius .

Helicotrema noun [ New Latin , from Greek "e`lix , -ikos , a helix + ... a hole.] (Anat.) The opening by which the two scalæ communicate at the top of the cochlea of the ear.

Helio- A combining form from Greek "h`lios the sun .

Heliocentric, Heliocentrical adjective [ Helio- + centric , centrical : confer French héliocentrique .] (Astron.) pertaining to the sun's center, or appearing to be seen from it; having, or relating to, the sun as a center; -- opposed to geocentrical .

Heliocentric parallax . See under Parallax . -- Heliocentric place , latitude , longitude , etc. (of a heavenly body), the direction, latitude, longitude, etc., of the body as viewed from the sun.

Heliochrome noun [ Helio- + Greek ... color.] A photograph in colors. R. Hunt.

Heliochromic adjective Pertaining to, or produced by, heliochromy.

Heliochromy noun The art of producing photographs in color.

Heliogram noun [ Helio- + -gram .] A message transmitted by a heliograph.

Heliograph noun [ Helio- + -graph .]ets>

1. A picture taken by heliography; a photograph.

2. An instrument for taking photographs of the sun.

3. An apparatus for telegraphing by means of the sun's rays. See Heliotrope , 3.

Heliograph transitive verb
1. To telegraph, or signal, with a heliograph.

2. To photograph by sunlight.

Heliographic adjective Of or pertaining to heliography or a heliograph; made by heliography.

Heliographic chart . See under Chart .

Heliographic adjective (Astron.) Of or pertaining to a description of the sun.

» Heliographic longitudes and latitudes of spots on the sun's surface are analogous to geographic longitudes and latitudes of places on the earth.

Heliography noun [ Helio- + -graphy .] Photography. R. Hunt.

Heliography noun
1. The description of the sun.

2. The system, art, or practice of telegraphing, or signaling, with the heliograph.

3. An early photographic process invented by Nicéphore Niepce, and still used in photo-engraving. It consists essentially in exposing under a design or in a camera a polished metal plate coated with a preparation of asphalt, and subsequently treating the plate with a suitable solvent. The light renders insoluble those parts of the film which is strikes, and so a permanent image is formed, which can be etched upon the plate by the use of acid.

Heliogravure noun [ French héliogravure .] The process of photographic engraving.

Heliogravure noun A plate or picture made by the process of heliogravure.

Heliolater noun [ Helio- + Greek ... servant, worshiper.] A worshiper of the sun.

Heliolatry noun [ Helio- + Greek ... service, worship.] Sun worship. See Sabianism .

Heliolite noun [ Helio- + -lite .] (Paleon.) A fossil coral of the genus Heliolites , having twelve-rayed cells. It is found in the Silurian rocks.

Heliometer noun [ Helio- + -meter : confer French héliomètre .] (Astron.) 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.

Heliometric, Heliometrical adjective Of or pertaining to the heliometer, or to heliometry.

Heliometry noun The apart or practice of measuring the diameters of heavenly bodies, their relative distances, etc. See Heliometer .

Heliopora noun [ New Latin , from Greek ... the sun + ... a passage, pore.] (Zoology) An East Indian stony coral now known to belong to the Alcyonaria; -- called also blue coral .

Helioscope noun [ Helio- + -scope : confer French hélioscope .] (Astron.) 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. -- He`li*o*scop`ic adjective

Heliostat noun [ Helio- + Greek ... placed, standing, from ... to place, stand: confer French héliostate .] 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.

Heliotrope noun [ French héliotrope , Latin heliotropium , Greek ...; ... the sun + ... to turn, ... turn. See Heliacal , Trope .]
1. (Anc. Astron.) An instrument or machine for showing when the sun arrived at the tropics and equinoctial line.

2. (Botany) A plant of the genus Heliotropium ; -- called also turnsole and girasole . H. Peruvianum is the commonly cultivated species with fragrant flowers.

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

4. (Min.) See Bloodstone (a) .

Heliotrope purple , a grayish purple color.

Heliotroper noun The person at a geodetic station who has charge of the heliotrope.

Heliotropic adjective (Botany) Manifesting heliotropism; turning toward the sun.

Heliotropism noun [ Helio- + Greek ... to turn.] (Botany) The phenomenon of turning toward the light, seen in many leaves and flowers.

Heliotype noun [ Helio- + -type .] A picture obtained by the process of heliotypy.

Heliotypic adjective Relating to, or obtained by, heliotypy.

Heliotypy noun A method of transferring pictures from photographic negatives to hardened gelatin plates from which impressions are produced on paper as by lithography.

Heliozoa noun plural [ New Latin , from Greek ... the sun + ... an animal.] (Zoology) An order of fresh-water rhizopods having a more or less globular form, with slender radiating pseudopodia; the sun animalcule.

Helispheric, Helispherical adjective [ Helix + spheric , spherical .] Spiral.

Helispherical line (Math.) . the rhomb line in navigation. [ R.]

Helium noun [ New Latin , from Greek ... the sun.] (Chemistry) A gaseous element found in the atmospheres of the sun and earth and in some rare minerals.

Helium (hē"lĭ*ŭm) noun [ New Latin , from Greek "h`lios the sun.] (Chemistry) An inert, monoatomic, gaseous element occurring in the atmosphere of the sun and stars, and in small quantities in the earth's atmosphere, in several minerals and in certain mineral waters. Symbol, He ; at. wt., 4. Helium was first detected spectroscopically in the sun by Lockyer in 1868; it was first prepared by Ramsay in 1895. Helium has a density of 1.98 compared with hydrogen, and is more difficult to liquefy than the latter. Chemically, it belongs to the argon group and cannot be made to form compounds. It is a decomposition product of the radium emanation.

Helix noun ; plural Latin Helices , English Helixes . [ Latin helix , Greek ..., ..., from ... to turn round; confer Latin volvere , and English volute , voluble .]
1. (Geom.) A nonplane curve whose tangents are all equally inclined to a given plane. The common helix is the curve formed by the thread of the ordinary screw. It is distinguished from the spiral , all the convolutions of which are in the plane.

2. (Architecture) A caulicule or little volute under the abacus of the Corinthian capital.

3. (Anat.) The incurved margin or rim of the external ear. See Illust. of Ear .

4. (Zoology) A genus of land snails, including a large number of species.

» The genus originally included nearly all shells, but is now greatly restricted. See Snail , Pulmonifera .

Hell noun [ Anglo-Saxon hell ; akin to Dutch hel , Old High German hella , German hölle , Icelandic hal , Swedish helfvete , Danish helvede , Goth. halja , and to Anglo-Saxon helan to conceal. .......... Confer Hele , transitive verb , Conceal , Cell , Helmet , Hole , Occult .]

1. The place of the dead, or of souls after death; the grave; -- called in Hebrew sheol , and by the Greeks hades .

He descended into hell .
Book of Common Prayer.

Thou wilt not leave my soul in hell .
Ps. xvi. 10.

2. The place or state of punishment for the wicked after death; the abode of evil spirits. Hence, any mental torment; anguish. "Within him hell ." Milton.

It is a knell
That summons thee to heaven or to hell .

3. A place where outcast persons or things are gathered ; as: (a) A dungeon or prison; also, in certain running games, a place to which those who are caught are carried for detention. (b) A gambling house. "A convenient little gambling hell for those who had grown reckless." W. Black. (c) A place into which a tailor throws his shreds, or a printer his broken type. Hudibras.

Gates of hell . (Script.) See Gate , noun , 4.

Hell transitive verb To overwhelm. [ Obsolete] Spenser.