from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Growing upward in a spiral that turns from right to left: a sinistrorse vine.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Turning to the left (of the observer) in the ascending line.
from the GNU version of the Collaborative International Dictionary of English
- adj. Turning to the left (of the spectator) in the ascending line; -- the opposite of dextrorse. See dextrorse.
from The Century Dictionary and Cyclopedia
- Turned or turning to the left; directed sinistrad; sinistrorsal: same as sinistral, but implying motion or direction rather than rest or position.
- In botany, rising from left to right, as a climbing plant. For the antagonistic senses in which dextrorse and consequently its opposite sinistrorse are used, see dextrorse.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adj. spiraling upward from right to left
Other plants twining spirally around an axis from right to left are called sinistrorse or sinistrorsal.
It's not that Turnbull is stupid-he can quote Kierkegaard and Pascal on angst and allude to the deaths of Schubert and Mozart and distinguish between a sinistrorse and a dextrorse Polygonum vine, etc.