From The Collaborative International Dictionary of English v.0.48 [gcide]:
Dextrorsal \Dex*tror"sal\, Dextrorse \Dex"trorse'\, adjective [L. dextrorsum, contr. fr. dextrovorsum, dextroversum, toward the right side; dexter right + versus, vorsus, p. p. of vertere, vortere, to turn.] (Botany) Turning from the left to the right, in the ascending line, as in the spiral inclination of the stem of the common morning-glory; as, dextrorse vines.
Note: At present scientists predicate dextrorse or sinistrorse quality of the plant regarded objectively; formerly the plant was regarded subjectively, and what is now called dextrorse was then considered sinistrorse.
From WordNet (r) 3.0 (2006) [wn]:
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