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Emerging from the light of the sun, or passing into it; rising or setting at the same, or nearly the same, time as the sun. Sir T. Browne.

In a heliacal manner. De Quincey.

An artificial, orange dyestuff, analogous to tropaolin, and like it used as an indicator in alkalimetry; -- called also methyl orange.

Of or pertaining to the Helianthoidea.

An order of Anthozoa; the Actinaria.

Of or pertaining to, or in the form of, a helix; spiral; as, a helical staircase; a helical spring. -- Hel"i*cal*ly, adv.

A genus of composite plants, with shining, commonly white or yellow, or sometimes reddish, radiated involucres, which are often called "everlasting flowers."

Having the form of a helix; spiral.

ed as a white crystalline substance by partial oxidation of salicin, from a willow (Salix Helix of Linnæus.)

Curled; spiral; helicoid; -- applied esp. to certain arteries of the penis.

An instrument for drawing spiral lines on a plane.

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

Same as Helicoid. -- Hel`i*coid"al*ly, adv.

A mountain in Boeotia, 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.

One of numerous species of Heliconius, a genus of tropical American butterflies. The wings are usually black, marked with green, crimson, and white.

Of or pertaining to Helicon. "Heliconian honey." Tennyson.

The opening by which the two scalæ communicate at the top of the cochlea of the ear.

A combining form from Gr. "h`lios the sun.

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 fro…

A photograph in colors. R. Hunt.