Heliocentric, -al, hē-li-o-sen′trik, -al, adj. (astron.) referred to the sun as centre.—adv. Heliocen′trically. [Gr. hēlios, the sun, kentron, the centre.]
Heliochromy, hē′li-ok-rō-mi, n. the art of producing photographs in the natural colours.—ns. Hē′liochrome, Heliochrō′motype, a photograph in the natural colours.—adj. Heliochrō′mic.
Heliograph, hē′li-o-graf, n. an apparatus for signalling by means of the sun's rays: an engraving obtained by a process in which a specially prepared plate is acted on chemically by exposure to light: an apparatus for taking photographs of the sun.—v.t. to signal to by means of the sun's rays.—n. Heliog′rapher.—adjs. Heliograph′ic, -al.—adv. Heliograph′ically.—ns. Heliog′raphy, a method of communicating swiftly between distant points by means of the sun's rays reflected from mirrors: photography; Heliogrā′vure (or hā-li-ō-gra-vür′), photo-engraving, or a print obtained by this process. [Gr. hēlios, the sun, graphē, a painting—graphein, to write.]
Heliolatry, hē-li-ol′a-tri, n. worship of the sun.—n. Heliol′ater, a worshipper of the sun.—adj. Heliol′atrous. [Gr. hēlios, the sun, latreia, worship.]
Heliology, hē-li-ol′ō-ji, n. the science of the sun.
Heliometer, hē-li-om′e-tėr, n. an instrument by which the diameters of the heavenly bodies can be measured with great accuracy.—adjs. Heliomet′ric, -al. [Gr. hēlios, sun, metron, a measure.]
Heliophilous, hē-li-of′i-lus, adj. fond of the sun—opp. to Heliophō′bic, fearing or shunning sunlight.
Helioscope, hē′li-o-skōp, n. a telescope for viewing the sun without injury to the eyes, by means of blackened glass or mirrors that reflect only a part of the light.—adj. Helioscop′ic. [Fr. hélioscope—Gr. hēlios, the sun, skopein, to look, to spy.]
Heliostat, hē′li-o-stat, n. an instrument by means of which a beam of sunlight is reflected in an invariable direction. [Gr. hēlios, sun, statos, fixed—histanai, to stand.]
Heliotrope, hē′li-o-trōp, n. a genus of plants of the natural order Boraginaceæ, many species with fragrant flowers, esp. the Peruvian heliotrope, with small lilac-blue flowers and a fragrance resembling vanilla or cherry-pie: (min.) a bloodstone, a variety of chalcedony of a dark-green colour variegated with red: a mirror placed at a distant station and adjusted by clockwork, so that at a particular hour of the day (arranged beforehand) the light of the sun shall be reflected from the mirror directly to the surveyor's station.—adjs. Heliotrop′ic, -al.—adv. Heliotrop′ically.—ns. Heliot′ropism, Heliot′ropy, the tendency that the stem and leaves of a seedling plant have to bend towards, and the roots from, the light when placed in a transparent vessel of water within reach of the light of a window. [Fr.,—L.,—Gr. hēliotropion—hēlios, the sun, tropos, a turn.]