| heliocentrical | <astronomy> 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 Parallax. Heliocentric place, latitude, longitude, etc. (of a heavenly body), the direction, latitude, longitude, etc, of the body as viewed from the sun. Origin: Helio- + centric, centrical: cf. F. Heliocentrique. Source: Websters Dictionary (01 Mar 1998) |
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| heliochrome | A photograph in colours. Origin: Helio- + Gr. Colour. Source: Websters Dictionary (01 Mar 1998) |
| heliochromy | The art of producing photographs in colour. Source: Websters Dictionary (01 Mar 1998) |
| heliograph | Origin: Helio- + -graph 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. Source: Websters Dictionary (01 Mar 1998) |
| heliographic | Of or pertaining to heliography or a heliograph; made by heliography. Heliographic chart. See Chart. Source: Websters Dictionary (01 Mar 1998) |
| heliography | 1. The science which relates to the action of light on sensitive bodies in the production of pictures, the fixation of images, and the like. 2. The art or process of producing pictures by this action of light. The well-focused optical image is thrown on a surface of metal, glass, paper, or other suitable substance, coated with collodion or gelatin, and sensitized with the chlorides, bromides, or iodides of silver, or other salts sensitive to light. The exposed plate is then treated with reducing agents, as pyrogallic acid, ferrous sulphate, etc, to develop the latent image. The image is then fixed by washing off the excess of unchanged sensitive salt with sodium hyposulphite (thiosulphate) or other suitable reagents. Origin: Photo-: cf. F. Photographie. Source: Websters Dictionary (01 Mar 1998) |
| heliogravure | The process of photographic engraving. Origin: F. Heliogravure. Source: Websters Dictionary (01 Mar 1998) |
| heliolite | <paleontology> A fossil coral of the genus Heliolites, having twelve-rayed cells. It is found in the Silurian rocks. Origin: Helio-. Source: Websters Dictionary (01 Mar 1998) |
| heliometer | <astronomy> 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. Origin: Helio-: cf. F. Heliometre. Source: Websters Dictionary (01 Mar 1998) |
| heliopathy | Injury from exposure to sunlight. Origin: helio-+ G. Pathos, suffering (05 Mar 2000) |
| heliophobia | <psychology> Morbid fear of exposure to the sun's rays. Origin: helio-+ G. Phobos, fear (05 Mar 2000) |
| heliopora | <zoology> An East Indian stony coral now known to belong to the Alcyonaria. Synonym: blue coral. Origin: NL, fr. Gr. The sun + a passage, pore. Source: Websters Dictionary (01 Mar 1998) |
| helioscope | <astronomy, instrument> A telescope or instrument for viewing the sun without injury to the eyes, as through coloured glasses, or with mirrors which reflect but a small portion of light. Helioscopic. Origin: Helio- + -scope: cf. F. Helioscope. Source: Websters Dictionary (01 Mar 1998) |
| heliosis | Synonym: sunstroke. Origin: helio-+ G. -osis, condition (05 Mar 2000) |
| heliotaxis | A form of phototaxis, and perhaps of thermotaxis, in which there is a tendency to growth or movement toward (positive heliotaxis) or away from (negative heliotaxis) the sun or the sunlight. Synonym: heliotropism. Origin: helio-+ G. Taxis, orderly arrangement (05 Mar 2000) |