sinistrorsal

adjective

1. Rising spirally from right to left (of the observer)

   sinistrorsal gyrations of a storm

2. sinistrorse.

Where it comes from

From Latin sinistrorsus, sinistroversus (“turned toward the left side”), from sinister (“left”) + vertere, vortere, versum, vorsum (“to turn”).

Adapted from the Wiktionary entry sinistrorsal (CC BY-SA 4.0).

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