Hektograph Hek"to·graph noun See Hectograph .

Helamys Hel·a·mys noun [ New Latin , from Greek ... fawn + ... mouse.] (Zoology) See Jumping hare , under Hare .

Helcoplasty Hel"co·plas`ty noun [ Greek ... a wound + -plasty .] (Medicine) The act or process of repairing lesions made by ulcers, especially by a plastic operation.

Held Held imperfect & past participle of Hold .

Hele Hele noun [ See Heal , noun ] Health; welfare. [ Obsolete] "In joy and perfyt hele ." Chaucer.

Hele Hele transitive verb [ Anglo-Saxon helan , akin to Dutch helen , Old High German helan , German hehlen , Latin celare . √17. See Hell , and confer Conceal .] To hide; to cover; to roof. [ Obsolete]

Hide and hele things.

Chaucer.

Helena Hel"e·na noun [ Latin : confer Spanish helena .] See St. Elmo's fire , under Saint .

Helenin Hel"e·nin noun (Chemistry) A neutral organic substance found in the root of the elecampane ( Inula helenium ), and extracted as a white crystalline or oily material, with a slightly bitter taste.

Heliac He"li·ac adjective Heliacal.

Heliacal He·li"a·cal adjective [ Greek ... belonging to the sun, from ... the sun: confer French héliaque .] (Astron.) Emerging from the light of the sun, or passing into it; rising or setting at the same, or nearly the same, time as the sun. Sir T. Browne.

» The heliacal rising of a star is when, after being in conjunction with the sun, and invisible, it emerges from the light so as to be visible in the morning before sunrising. On the contrary, the heliacal setting of a star is when the sun approaches conjunction so near as to render the star invisible.

Heliacally He·li"a·cal·ly adverb In a heliacal manner. De Quincey.

Helianthin He`li·an"thin noun [ Prob. from Latin helianthes , or New Latin helianthus , sunflower, in allusion to its color.] (Chemistry) An artificial, orange dyestuff, analogous to tropaolin, and like it used as an indicator in alkalimetry; -- called also methyl orange .

Helianthoid He`li·an"thoid adjective (Zoology) Of or pertaining to the Helianthoidea.

Helianthoidea He`li·an"thoi"de·a noun plural [ New Latin , from Latin helianthes sunflower + -oid .] (Zoology) An order of Anthozoa; the Actinaria.

Helical Hel"i·cal 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 Hel`i·chry"sum 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 He·lic"i·form adjective [ Helix + -form .] Having the form of a helix; spiral.

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

Helicine Hel"i·cine adjective (Anat.) Curled; spiral; helicoid; -- applied esp. to certain arteries of the penis.

Helicograph Hel"i·co·graph` noun [ Helix + -graph .] An instrument for drawing spiral lines on a plane.

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

Helicon Hel"i·con 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.

Gray.

Heliconia Hel`i·co"ni·a 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 Hel`i·co"ni·an 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 Hel`i·co"tre"ma 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- He"li·o- A combining form from Greek "h`lios the sun .

Heliocentric, Heliocentrical He`li·o·cen"tric, He`li·o·cen"tric"al 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 He"li·o·chrome noun [ Helio- + Greek ... color.] A photograph in colors. R. Hunt.

Heliochromic He`li·o·chro"mic adjective Pertaining to, or produced by, heliochromy.

Heliochromy He"li·o·chro`my noun The art of producing photographs in color.

Heliogram He"li·o·gram noun [ Helio- + -gram .] A message transmitted by a heliograph.

Heliograph He"li·o·graph 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 He"li·o·graph transitive verb 1. To telegraph, or signal, with a heliograph.

2. To photograph by sunlight.

Heliographic He`li·o·graph"ic adjective Of or pertaining to heliography or a heliograph; made by heliography.

Heliographic chart . See under Chart .

Heliographic He`li·o·graph"ic 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 He`li·og"ra·phy noun [ Helio- + -graphy .] Photography. R. Hunt.

Heliography He`li·og"ra·phy 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 He`li·o·grav"ure noun [ French héliogravure .] The process of photographic engraving.

Heliogravure He`li·o·grav"ure noun A plate or picture made by the process of heliogravure.

Heliolater He`li·ol"a·ter noun [ Helio- + Greek ... servant, worshiper.] A worshiper of the sun.

Heliolatry He`li·ol"a·try noun [ Helio- + Greek ... service, worship.] Sun worship. See Sabianism .

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

Heliometer He`li·om"e·ter 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 He`li·o·met"ric, He`li·o·met"ric·al adjective Of or pertaining to the heliometer, or to heliometry.

Heliometry He`li·om"e·try noun The apart or practice of measuring the diameters of heavenly bodies, their relative distances, etc. See Heliometer .

Heliopora He`li·op"o·ra 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 He"li·o·scope 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 He"li·o·stat 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.

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