Sin′is‐tror″sal (?), a. [L. sinistrorsus, sinistroversus, turned toward the left side; sinister left + vertere, vortere, versum, vorsum, to turn.] Rising spirally from right to left (of the spectator); sinistrorse.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.