n.; pl. Anthelia [ Pref. anti + Gr. &unr_; sun. ] (Meteor.) A halo opposite the sun, consisting of a colored ring or rings around the shadow of the spectator's own head, as projected on a cloud or on an opposite fog bank. [ 1913 Webster ]

n. (Anat.) Same as Antihelix. [ 1913 Webster ]

n. (Anat.) The curved elevation of the cartilage of the ear, within or in front of the helix. See Ear. [ 1913 Webster ]

n.; pl. Aphelia [ Gr. &unr_; + &unr_; sun. ] (Astron.) That point of a planet's or comet's orbit which is most distant from the sun, the opposite point being the perihelion. [ 1913 Webster ]

a. [ Gr. &unr_; + &unr_; sun + &unr_; belonging to a turning. ] Turning away from the sun; -- said of leaves, etc. Darwin. [ 1913 Webster ]

n. The habit of bending from the sunlight; -- said of certain plants. [ 1913 Webster ]

n. [ AS. æðeling noble, fr. æðele noble, akin to G. adel nobility, edel noble. The word æðel, E. ethel, is in many AS. proper names, as Ethelwolf, noble wolf; Ethelbald, noble bold; Ethelbert, noble bright. ] An Anglo-Saxon prince or nobleman; esp., the heir apparent or a prince of the royal family. [ Written also Adeling and Ætheling. ] [ 1913 Webster ]

‖n.; pl. Cheliceræ [ NL., fr. Gr. chhlh` claw + ke`ras horn. ] (Zool.) One of the anterior pair of mouth organs, terminated by a pincherlike claw, in scorpions and allied Arachnida. They are homologous with the falcers of spiders, and probably with the mandibles of insects. [ 1913 Webster ]

adj. having chelicerae. [ WordNet 1.5 ]

n. [ NL., fr. Gr. chelidw`n. ] (Anat.) The hollow at the flexure of the arm. [ 1913 Webster ]

a. [ See Celandine. ] (Chem.) Of, pertaining to, or derived from, the celandine. [ 1913 Webster ]

Chelidonic acid, a weak acid extracted from the celandine (Chelidonium majus), as a white crystalline substance. [ 1913 Webster ]

n. a genu having only one species; the greater celandine.
Syn. -- genus Chelidonium. [ WordNet 1.5 ]

‖n. [ L. (sc. lapillus.) ] A small stone taken from the gizzard of a young swallow. -- anciently worn as a medicinal charm. [ 1913 Webster ]

n. [ Gr. chhlh` claw + -fer. ] (Zool.) See Book scorpion, under Book. [ 1913 Webster ]

a. [ Gr. chhlh` claw + -ferous. ] (Zool.) Having cheliform claws, like a crab. [ 1913 Webster ]

a. [ Gr. chhlh` claw + -form. ] (Zool.) Having a movable joint or finger closing against a preceding joint or a projecting part of it, so that the whole may be used for grasping, as the claw of a crab; pincherlike. [ 1913 Webster ]

a. [ Gr. &unr_; through, at variance + &unr_; sun + &unr_; turning. ] (Bot.) Relating or, or manifesting, diaheliotropism. [ 1913 Webster ]

n. (Bot.) A tendency of leaves or other organs of plants to have their dorsal surface faced towards the rays of light. [ 1913 Webster ]

a. (Anat.) Of, or relating to, endothelium. [ 1913 Webster ]

‖n.; pl. Endothelia [ NL., fr. Gr. 'e`ndon within + &unr_; nipple. ] (Anat.) The thin epithelium lining the blood vessels, lymphatics, and serous cavities. See Epithelium. [ 1913 Webster ]

a. Of or pertaining to epithelium; as, epithelial cells; epithelial cancer. [ 1913 Webster ]

a. [ Epithelium + -oid. ] (Anat.) Like epithelium; as, epithelioid cells. [ 1913 Webster ]

‖n. [ NL. See Epithelium, and -oma. ] (Med.) A malignant growth containing epithelial cells; -- called also epithelial cancer. [ 1913 Webster ]

n.; pl. E. Epitheliums L. Epithelia [ NL., fr. Gr. 'epi` upon + &unr_; nipple. ] (Anat.) The superficial layer of cells lining the alimentary canal and all its appendages, all glands and their ducts, blood vessels and lymphatics, serous cavities, etc. It often includes the epidermis (i. e., keratin-producing epithelial cells), and it is sometimes restricted to the alimentary canal, the glands and their appendages, -- the term endothelium being applied to the lining membrane of the blood vessels, lymphatics, and serous cavities. [ 1913 Webster ]

a. [ See Gael. ] Of, belonging to, or designating, that division of the Celtic languages which includes the Irish, Gaelic, and Manx. [ Webster 1913 Suppl. ]

a. Heliacal. [ 1913 Webster ]

a. [ Gr. &unr_; belonging to the sun, fr. &unr_; the sun: cf. F. héliaque. ] (Astron.) 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. [ 1913 Webster ]

☞ The heliacal rising of a star is when, after being in conjunction with the sun, and invisible, it emerges from the light so as to be visible in the morning before sunrising. On the contrary, the heliacal setting of a star is when the sun approaches conjunction so near as to render the star invisible. [ 1913 Webster ]

adv. In a heliacal manner. De Quincey. [ 1913 Webster ]

n. [ Prob. fr. L. helianthes, or NL. helianthus, sunflower, in allusion to its color. ] (Chem.) An artificial, orange dyestuff, analogous to tropaolin, and like it used as an indicator in alkalimetry; -- called also methyl orange. [ 1913 Webster ]

a. (Zool.) Of or pertaining to the Helianthoidea. [ 1913 Webster ]

‖n. pl. [ NL., fr. L. helianthes sunflower + -oid. ] (Zool.) An order of Anthozoa; the Actinaria. [ 1913 Webster ]

n. any plant of the genus Helianthus having large flower heads with dark disk florets and showy yellow rays.
Syn. -- sunflower. [ WordNet 1.5 ]

a. [ From Helix. ] Of or pertaining to, or in the form of, a helix; spiral; as, a helical staircase; a helical spring. -- Hel"i*cal*ly, adv. [1913 Webster]

‖n. [ L., the marigold, fr. Gr. &unr_; a kind of plant. ] (Bot.) A genus of composite plants, with shining, commonly white or yellow, or sometimes reddish, radiated involucres, which are often called “everlasting flowers.” [ 1913 Webster ]

a. [ Helix + -form. ] Having the form of a helix; spiral. [ 1913 Webster ]

n. (Chem.) A glucoside obtained as a white crystalline substance by partial oxidation of salicin, from a willow (Salix Helix of Linnaeus.) [ 1913 Webster ]

a. (Anat.) Curled; spiral; helicoid; -- applied esp. to certain arteries of the penis. [ 1913 Webster ]

n. [ Helix + -graph. ] An instrument for drawing spiral lines on a plane. [ 1913 Webster ]

a. [ Gr. &unr_;; &unr_;, &unr_;, spiral + &unr_; shape: cf. F. hélicoïde. See Helix. ] [ 1913 Webster ]

1. Spiral; curved, like the spire of a univalve shell. [ 1913 Webster ]

2. (Zool.) Shaped like a snail shell; pertaining to the Helicidae, or Snail family. [ 1913 Webster ]

Helicoid parabola (Math.), the parabolic spiral. [ 1913 Webster ]

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. [ 1913 Webster ]

a. Same as Helicoid. -- Hel`i*coid"al*ly, adv. [1913 Webster]

prop. n. [ L., fr. Gr. "Elikw`n.] A mountain in Bœotia, in Greece, supposed by the Greeks to be the residence of Apollo and the Muses. [1913 Webster]

From Helicon's harmonious springs
A thousand rills their mazy progress take. Gray. [1913 Webster]

‖n. [ NL. See Helicon. ] (Zool.) One of numerous species of Heliconius, a genus of tropical American butterflies. The wings are usually black, marked with green, crimson, and white. [ 1913 Webster ]

a. [ L. Heliconius. ] 1. Of or pertaining to Helicon. “Heliconian honey.” Tennyson. [ 1913 Webster ]

2. (Zool.) Like or pertaining to the butterflies of the genus Heliconius. [ 1913 Webster ]

n. [ NL., fr. Gr. "e`lix, "e`likos, a spiral + ptero`n a wing. ] a heavier-than-air aircraft whose lift is provided by the aerodynamic forces on rotating blades rather than on fixed wings. Contrasted with fixed-wing aircraft. [ PJC ]

v. i. to travel in a helicopter. [ PJC ]

v. t. to transport in a helicopter. [ PJC ]

‖n. [ NL., fr. Gr. "e`lix, "e`likos, a helix + &unr_; a hole. ] (Anat.) The opening by which the two scalae communicate at the top of the cochlea of the ear. [ 1913 Webster ]

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

{ } a. [ Helio- + centric, centrical: cf. F. héliocentrique. ] (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. [ 1913 Webster ]

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. [ 1913 Webster ]