Sinistrorsal

• (a.) Rising spirally from right to left (of the spectator); sinistrorse.
Found on http://thinkexist.com/dictionary/meaning/sinistrorsal/

Sinistrorsal

Sin`is·tror'sal adjective [ Latin 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.
Found on http://www.encyclo.co.uk/webster/S/107
No exact match found