- coiled or curving like a spiral.
- Geometry. a warped surface generated by a straight line moving so as to cut or touch a fixed helix.
Origin of helicoid
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for helicoidal
The rock was singularly striated, the scratches arranged concentrically and in helicoidal curves.The Collected Works of Ambrose Bierce
The most interesting application of the helicoidal saw is in the exploitation of quarries.
Some genera with helicoidal shells are related to these coiled forms, viz.
- biology shaped like a spirala helicoid shell
- geometry any surface resembling that of a screw thread
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
- Arranged in or having the general shape of a flattened coil or spiral.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
- Arranged in or having the approximate shape of a flattened coil or spiral curve.
- A surface in the form of a coil or screw. A helicoid is generated mathematically by rotating a plane or twisted curve about an axis at a fixed rate and simultaneously translating it in the direction of the line of axis, also at a fixed rate.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.