helicoid

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helicoid
a helicoid generated by rotating and translating a line at a constant rate about an axis to which it is perpendicular

hel·i·coid

 (hĕl′ĭ-koid′, hē′lĭ-)
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.

[Greek helikoeidēs : helix, helik-, spiral; see helix + -oeidēs, -oid.]

helicoid

(ˈhɛlɪˌkɔɪd)
adj
(Biology) biology shaped like a spiral: a helicoid shell.
n
(Mathematics) geometry any surface resembling that of a screw thread
ˌheliˈcoidally adv

hel•i•coid

(ˈhɛl ɪˌkɔɪd, ˈhi lɪ-)

adj.
1. coiled or curving like a spiral.
n.
2. a warped geometric surface generated by a straight line moving so as to cut or touch a fixed helix.
[1690–1700; < Greek helikoeidḗs. See helix, -oid]
hel`i•coi′dal, adj.
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