SINISTRORSAL
sinistrorse, sinistrorsal
(adjective) spiraling upward from right to left; “sinistrorse vines”
Source: WordNet® 3.1
Etymology
Adjective
sinistrorsal (not comparable)
Rising spirally from right to left (of the observer); sinistrorse.
Source: Wiktionary
Sin`is*tror"sal, a. Etym: [L.sinistrorsus, sinistroversus, turned
toward the left side; sinister left + vertere, vortere, versum,
vorsum, to turn.]
Definition: Rising spirally from right to left (of the spectator);
sinistrorse.
Source: Webster’s Unabridged Dictionary 1913 Edition