helicoidal
Adjective
Meaning
Same as Helicoid.
Source: Webster's dictionarySynonyms
Antonyms
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An actual marine propeller is made up of sections of helicoidal surfaces which act together 'screwing' through the water (hence the common reference to marine propellers as " screws ").
In the corona, on the contrary, the mean free-path of the electrons is of the order of kilometres and even more, so each electron can do a helicoidal motion long before being scattered after a collision.
Meanwhile, in the functional category, Hallstar (Micah) and Inter Actifs – Aceto Corporation (Helicoidal Emulsion Technology) both received Silver awards, while Lucas Meyer Cosmetics (Siligel™) took the Bronze prize.
This effect is the result of a three-dimensional intersection of helicoidal columns (for example a square cross-section column twisting clockwise and a similar one twisting counter-clockwise).