He`li*o*graph"ic, a. (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.
He`li*og"ra*phy, n. 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.
He`li*o*grav"ure, n. A plate or picture made by the process of heliogravure.
He"li*um (h"l*m), n. [NL., fr. Gr. "h`lios the sun.] (Chem.) 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.
He`ma*tin"ic (?), n. [From Hematin.] (Med.) Any substance, such as an iron salt or organic compound containing iron, which when ingested tends to increase the hemoglobin contents of the blood.
Hen`ri*et"ta cloth` (?). A fine wide wooled fabric much used for women's dresses.
Hep"pel*white (?), a. (Furniture) Designating a light and elegant style developed in England under George III., chiefly by Messrs. A.Heppelwhite & Co.
Her"mit, n. (Cookery) A spiced molasses cooky, often containing chopped raisins and nuts.
||Her"ren*haus` (?), n. [G., House of Lords.] See Legislature, Austria, Prussia.
Hertz"i*an (?), a. Of or pert. to the German physicist Heinrich Hertz.
Hertzian telegraphy, telegraphy by means of the Hertzian waves; wireless telegraphy. -- H. waves, electric waves; -- so called because Hertz was the first to investigate them systematically. His apparatus consisted essentially in an oscillator for producing the waves, and a resonator for detecting them. The waves were found to have the same velocity as light, and to undergo reflection, refraction, and polarization.
||Her"zog (?), n. [G., akin to AS. heretoga, lit., army leader. See Harry, and Duke.] A member of the highest rank of nobility in Germany and Austria, corresponding to the British duke.
{ ||He*tæ"ra (?), ||He*tai"ra (?) }, n.; pl. -ræ (#). [NL. See Hetairism.] (Gr. Antiq.) A female paramour; a mistress, concubine, or harlot. -- He*tæ"ric, He*tai"ric (#), a.
Het`er*œ"cious (?), a. [Hetero- + Gr. &?; house.] (Bot.) Passing through the different stages in its life history on an alternation of hosts, as the common wheat-rust fungus (Puccinia graminis), and certain other parasitic fungi; -- contrasted with autœcious. -- Het`er*œ"cism (#), n.
Hex"a*gram (?), n. [Hexa- + - gram.] A figure of six lines; specif.: (a) A figure composed of two equal triangles intersecting so that each side of one triangle is parallel to a side of the other, and the six points coincide with those of a hexagon. (b) In Chinese literature, one of the sixty-four figures formed of six parallel lines (continuous or broken), forming the basis of the Yih King, or "Book of Changes." S. W. Williams.
Hex"ose (?), n. [Hexa- + - ose.] (Chem.) Any member of a group of sugars containing six carbon atoms in the molecule. Some are widely distributed in nature, esp. in ripe fruits.
||Hi*dro"sis (?), n. [Written also, but incorrectly, idrosis.] [NL., fr. Gr. &?; to sweat, &?; sweat.] 1. (Physiol.) Excretion of sweat; perspiration.
2. (Med.) Excessive perspiration; also, any skin disease characterized by abnormal perspiration.
Hi*drot"ic (?), a. [Gr. &?; sudorific.] (Med.) Causing perspiration; diaphoretic or sudorific.
Hi*drot"ic, n. A medicine that causes perspiration; a diaphoretic or a sudorific.
High"boy`, n. 1. One who lives high; also, in politics, a highflyer.
2. A kind of set of drawers. [U. S.] "Mahogany highboys glittering with brass handles." K. L. Bates.
High"er crit"i*cism. Criticism which includes the study of the contents, literary character, date, authorship, etc., of any writing; as, the higher criticism of the Pentateuch. Called also historical criticism.
The comparison of the Hebrew and Greek texts . . . introduces us to a series of questions affecting the composition, the editing, and the collection of the sacred books. This class of questions forms the special subject of the branch of critical science which is usually distinguished from the verbal criticism of the text by the name of higher, or historical, criticism.
W. Robertson Smith.