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. --