[hel-i-koid, hee-li-]
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.

1690–1700; < Greek helikoeidḗs of spiral form. See helic-, -oid

helicoidal, adjective
helicoidally, adverb
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World English Dictionary
helicoid (ˈhɛlɪˌkɔɪd)
1.  biology shaped like a spiral: a helicoid shell
2.  geometry any surface resembling that of a screw thread

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American Heritage
Medical Dictionary

helicoid hel·i·coid (hěl'ĭ-koid', hē'lĭ-)
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.
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American Heritage
Science Dictionary
helicoid   (hěl'ĭ-koid', hē'lĭ-)  Pronunciation Key 
Adjective   Arranged in or having the approximate shape of a flattened coil or spiral curve.

Noun   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.
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