(n) a genus of helical or curved or straight aerobic bacteria with rounded ends and multiple flagella; found in the gastric mucosa of primates (including humans), Syn.genus Heliobacter
(n) the type species of genus Heliobacter; produces urease and is associated with several gastroduodenal diseases (including gastritis and gastric ulcers and duodenal ulcers and other peptic ulcers), Syn.H. pylori
(n) an instrument used to measure the angular separation of two stars that are too far apart to be included in the field of view of an ordinary telescope
(n) the boundary marking the edge of the sun's influence; the boundary (roughly 100 AU from the sun) between the interplanetary medium and the interstellar medium; where the solar wind from the sun and the radiation from other stars meet
The Collaborative International Dictionary of English (GCIDE) v.0.53
{ } a. [ Helio- + centric, centrical: cf. F. 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. [ 1913 Webster ]
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. [ 1913 Webster ]
a. (Astron.) 1. Of or pertaining to a description of the sun. [ Webster 1913 Suppl. ]
☞ Heliographic longitudes and latitudes of spots on the sun's surface are analogous to geographic longitudes and latitudes of places on the earth. [ Webster 1913 Suppl. ]
2. Of or pertaining to heliography or a heliograph; made by heliography. [ 1913 Webster ]
Heliographic chart. See under Chart. [ 1913 Webster ]
n. 1. [ Helio- + -graphy. ] The description of the sun. [ Webster 1913 Suppl. ]
2. The system, art, or practice of telegraphing, or signaling, with the heliograph. [ Webster 1913 Suppl. ]
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. [ Webster 1913 Suppl. ]
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