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helicoid |
2 definitions found From Webster's Revised Unabridged Dictionary (1913) [web1913]: Helicoid \Hel"i*coid\, a. [Gr. ?; "e`lix, -ikos, spiral + ? shape: cf F. h['e]lico["i]de. See {Helix}.] 1. Spiral; curved, like the spire of a univalve shell. 2. (Zo["o]l.) Shaped like a snail shell; pertaining to the {Helicid[ae]}, or Snail family. {Helicoid parabola} (Math.), the parabolic spiral. From Webster's Revised Unabridged Dictionary (1913) [web1913]: Helicoid \Hel"i*coid\, 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
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