- on the left-hand side; left
- having whorls that rise to the apex in clockwise spirals from the opening at the lower left: said of the shells of some gastropods
Origin of sinistralOld French from Classical Latin sinistra, left hand: see sinister
- Of or facing the left side.
- Zoology Relating to or being a gastropod shell that has its aperture to the left when facing the observer with the apex upward.