a. [ From Helix. ] Of or pertaining to, or in the form of, a helix; spiral;
‖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 ]
Helicoid parabola (Math.),
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. --
prop. n. [ L., fr. Gr.
From Helicon's harmonious springs
A thousand rills their mazy progress take. Gray. [1913 Webster]