from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Arranged in or having the approximate shape of a flattened coil or spiral.
  • n. Mathematics A surface in the form of a coil or screw.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Having the form of a flattened helix
  • n. A minimal surface in the form of a flattened helix.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Spiral; curved, like the spire of a univalve shell.
  • adj. Shaped like a snail shell; pertaining to the Helicidæ, or Snail family.
  • 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.

from The Century Dictionary and Cyclopedia

  • Pertaining to or having the form of a helix; screw-shaped; coiled like a helix. See cut under Foraminifera. Also helicoidal.
  • In conchology, pertaining to or resembling the Helicidæ
  • n. In geometry, any one of several different surfaces. See the phrases below
  • n. A helicoid parabola.


Greek helikoeidēs : helix, helik-, spiral; see helix + -oeidēs, -oid.
(American Heritage® Dictionary of the English Language, Fourth Edition)



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