helicoid

POS

Adjective, Noun

HYPHEN

hel=i=coid

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CIDE DICTIONARY

helicoid, a. [Gr. ; , , spiral + shape: cf. F. hélicoïde. See Helix.].

Spiral; curved, like the spire of a univalve shell. [1913 Webster]
Shaped like a snail shell; pertaining to the Helicidæ, or Snail family. [1913 Webster]

Helicoid parabola (Math.), the parabolic spiral.

helicoid, n.

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]

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