Hel″i‐cal (?), a. [From Helix.] Of or pertaining to, or in the form of, a helix; spiral; as, a helical staircase; a helical spring. — Hel″i‐cal‐ly, adv.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.