adjective. Growing upward in a spiral that turns from left to right.

Rising from right to left, as a spiral line, helix, or climbing plant.

adjective. Turning from the left to the right, in the ascending line, as in the spiral inclination of the stem of the morning glory.

adjective. spiraling upward from left to right

"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."

dextral