from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Botany Growing upward in a spiral that turns from left to right: a dextrorse vine.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Turning from the left to the right, in the ascending line, as in the spiral inclination of the stem of the morning glory.
from The Century Dictionary and Cyclopedia
- Rising from right to left, as a spiral line, helix, or climbing plant.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adj. spiraling upward from left to right
Latin dextrōrsus, from dextrōvorsus, turning toward the right : dexter, right; see dextro- + versus, past participle of vertere, to turn.(American Heritage® Dictionary of the English Language, Fourth Edition)
Latin dextrorsum, contracted from dextrovorsum, dextroversum, toward the right side; dexter right + versus, vorsus, past participle of vertere, vortere, to turn. (Wiktionary)
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.