Part 783

Hel"i*cin (?), n. (Chem.) A glucoside obtained as a white crystalline substance by partial oxidation of salicin, from a willow (Salix Helix of LinnÊus.)

Hel"i*cine (?), a. (Anat.) Curled; spiral; helicoid; -- applied esp. to certain arteries of the penis.

Hel"i*co*graph` (?), n. [Helix + -graph.] An instrument for drawing spiral lines on a plane.

Hel"i*coid (?), a. [Gr. &?;; "e`lix, -ikos, spiral + &?; shape: cf. F. hÈlicoÔde. See Helix.]

1. Spiral; curved, like the spire of a univalve shell.

2. (Zoˆl.) Shaped like a snail shell; pertaining to the HelicidÊ, or Snail family.

Helicoid parabola (Math.), the parabolic spiral.

Hel"i*coid, n. (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.

Hel`i*coid"al (?), a. Same as Helicoid. -- Hel`i*coid"al*ly, adv.

Hel"i*con (?), n. [L., fr. Gr. &?;.] A mountain in Búotia, 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.

||Hel`i*co"ni*a (?), n. [NL. See Helicon.] (Zoˆl.) One of numerous ||species of Heliconius, a genus of tropical American butterflies. The ||wings are usually black, marked with green, crimson, and white.

Hel`i*co"ni*an (?), a. [L. Heliconius.] 1. Of or pertaining to Helicon. "Heliconian honey." Tennyson.

2. (Zoˆl.) Like or pertaining to the butterflies of the genus Heliconius.

||Hel`i*co"tre"ma (?), n. [NL., fr. Gr. "e`lix, -ikos, a helix + &?; a ||hole.] (Anat.) The opening by which the two scalÊ communicate at the ||top of the cochlea of the ear.

He"li*o- (?). A combining form from Gr. "h`lios the sun.

{ He`li*o*cen"tric (?), He`li*o*cen"tric"al (?), } a. [Helio- + centric, centrical: cf. F. hÈliocentrique.] (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.

He"li*o*chrome (?), n. [Helio- + Gr. &?; color.] A photograph in colors. R. Hunt.

He`li*o*chro"mic (?), a. Pertaining to, or produced by, heliochromy.

He"li*o*chro`my (?), n. The art of producing photographs in color.

He"li*o*graph (?), n. [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.

He`li*o*graph"ic (?), a. Of or pertaining to heliography or a heliograph; made by heliography.

Heliographic chart. See under Chart.