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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.]  (click for a larger image) helicoida helicoid generated by rotating and translating a line at a constant rate about an axis to which it is perpendicular |
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