sinistrorse


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Related to sinistrorse: dextrose

sin·is·trorse

(si-nĭs-trōrs),
Turned or twisted to the left.
[L. sinistrorsus, on the left side, fr. sinister, left, + verto, pp. versus, to turn]
Farlex Partner Medical Dictionary © Farlex 2012

sinistrorse

having an anti-clockwise or left-handed spiral form as do most gastropod shells.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
References in periodicals archive ?
Corolla salveriform to infundibuliform or rarely tubular campanulate; aestivation sinistrorse in Wrightia, Pleioceras, and Stephanostemma; often with conspicuous corona of flat, petaloid segments in mouth.
Calycine colleters few and alternisepalous or numerous and spread across base of sepal inside (rarely absent); corolla salveriform, campanulate, or urceolate; corolla-lobe aestivation dextrorse (sinistrorse in Parameria), rarely valvate; corona, if present, mostly as small pouches in petal sinuses, sometimes lower down on corolla tube behind stamens (Apocynum with alternistaminal appendages near base of corolla tube).