S0429300 (sĭn′ĭ-strəl, sĭ-nĭs′trəl)adj.1. Of or facing the left side.2. Left-handed.3. Zoology Relating to or being a gastropod shell that has its aperture to the left when facing the observer with the apex upward.sin′is·tral·ly adv.MedicalSeesinistral