σανίς

Etymology
The formation is common to other technical terms like, and  but the origin is. According to Beekes, the connection with should be rejected for semantic reasons.

Noun

 * 1) board, plank, timber
 * 2)  folding doors
 * 3) wooden platform, scaffold or stage
 * 4) ship's deck
 * 5) bench, seat
 * 6) lid of box
 * 7)  wooden tablets for writing on
 * 8) plank to which offenders were bound or nailed