sinistral adjective & noun. ['sɪnɪstr(ǝ)l] LME.
[from SINISTER + -AL¹.]
A. adjective.
I. 1. Attended by misfortune or disaster, unlucky, unfortunate. rare. Only in LME.

2. = SINISTER 1. M-L16.

[TahlilGaran] English Dictionary ▲

sinistral
II.

3. Situated on the left-hand side; of or pertaining to the left hand or left-hand side. E19.

4. Conchology. Of a spiral shell: having the whorls ascending from right to left (of the observer); reversed, left-handed. M19.

5. Of a person: (predominantly) left-handed. E20.

6. Geology. Of, pertaining to, or designating a strike-slip fault in which the motion of the block on the further side of the fault from an observer is towards the left. M20.
b. noun. A (predominantly) left-handed person. E20.

► Opp. DEXTRAL.

■ sini'strality noun the state or quality of being sinistral; esp. left-handedness: M19.

■ sinistrally adverb (a) rare adversely, falsely; (b) in a sinistral direction, to the left: M16.

[TahlilGaran] English Dictionary ▲