Etymology
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helical (adj.)

"spiral-shaped," c. 1600, from Latin helicem (nominative helix) "spiral" (see helix) + -al (1).

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Definitions of helical

helical (adj.)
in the shape of a coil;
Synonyms: coiling / spiral / spiraling / volute / voluted / whorled / turbinate
From wordnet.princeton.edu