Definition of "helicoid" []

• Arranged in or having the approximate shape of a flattened coil or spiral. (adjective)
• Mathematics A surface in the form of a coil or screw. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Will someone please tell me if a helicoid (a mixer ribbon flight) can be flattened (less than 360 deg segment)?"
• "Will someone please tell me if a helicoid (a mixer ribbon flight) can be"
• "This paper introduces features of the titled exchange lenses on the following items: for 35 mm single-lens reflex cameras 1) Al exterior provides high grade feeling to both and little allowance at aperture and helicoid parts provides precise structure sense, 2) FA 77 mm/F1. 8"