helicoid

• POS: Adjective, Noun
• HYPHEN: hel=i=coid

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]