/ Dictionary / Index S sinistrorse: Meaning and Definition of Find definitions for: sin•is•trorse Pronunciation: (sin'u-strôrs", si-nis'trôrs, sin"u-strôrs'), [key] — adj. Bot. (from a point of view at the center of the spiral) rising spirally in a counterclockwise manner, as a stem (opposed to dextrorse). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: sinistrorse (Thesaurus) sinistrodextral sinistrous Related Content Daily Word Quiz: neologism Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language