[hel-i-koid, hee-li-] /ˈhɛl ɪˌkɔɪd, ˈhi lɪ-/

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.
(biology) shaped like a spiral: a helicoid shell
(geometry) any surface resembling that of a screw thread

helicoid hel·i·coid (hěl’ĭ-koid’, hē’lĭ-)
Arranged in or having the general shape of a flattened coil or spiral.
(hěl’ĭ-koid’, hē’lĭ-)
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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