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- English Word Heliacal Definition 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.
- English Word Heliacally Definition In a heliacal manner.
- English Word Helianthin Definition An artificial, orange dyestuff, analogous to tropaolin, and like it used as an indicator in alkalimetry; -- called also methyl orange.
- English Word Helianthoid Definition Of or pertaining to the Helianthoidea.
- English Word Helianthoidea Definition An order of Anthozoa; the Actinaria.
- English Word Helical Definition Of or pertaining to, or in the form of, a helix; spiral; as, a helical staircase; a helical spring.
- English Word Helices Definition of Helix
- English Word Helichrysum Definition A genus of composite plants, with shining, commonly white or yellow, or sometimes reddish, radiated involucres, which are often called "everlasting flowers."
- English Word Heliciform Definition Having the form of a helix; spiral.
- English Word Helicin Definition A glucoside obtained as a white crystalline substance by partial oxidation of salicin, from a willow (Salix Helix of Linnaeus.)
- English Word Helicine Definition Curled; spiral; helicoid; -- applied esp. to certain arteries of the penis.
- English Word Helicograph Definition An instrument for drawing spiral lines on a plane.
- English Word Helicoid Definition Spiral; curved, like the spire of a univalve shell.
- English Word Helicoid Definition Shaped like a snail shell; pertaining to the Helicidae, or Snail family.
- English Word Helicoid Definition 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.
- English Word Helicoidal Definition Same as Helicoid.
- English Word Helicon Definition A mountain in Boeotia, in Greece, supposed by the Greeks to be the residence of Apollo and the Muses.
- English Word Heliconia Definition One of numerous species of Heliconius, a genus of tropical American butterflies. The wings are usually black, marked with green, crimson, and white.
- English Word Heliconian Definition Of or pertaining to Helicon.
- English Word Heliconian Definition Like or pertaining to the butterflies of the genus Heliconius.
- English Word Helicotrema Definition The opening by which the two scalae communicate at the top of the cochlea of the ear.
- English Word Helio- Definition A combining form from Gr. "h`lios the sun.
- English Word Heliocentric Definition Alt. of Heliocentrical
- English Word Heliocentrical Definition 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.
- English Word Heliochrome Definition A photograph in colors.
- English Word Heliochromic Definition Pertaining to, or produced by, heliochromy.
- English Word Heliochromy Definition The art of producing photographs in color.
- English Word Heliograph Definition A picture taken by heliography; a photograph.
- English Word Heliograph Definition An instrument for taking photographs of the sun.
- English Word Heliograph Definition An apparatus for telegraphing by means of the sun's rays. See Heliotrope, 3.