σελίς

Etymology
Clearly related to. These words have been compared to 🇨🇬 and, and to 🇨🇬, but phonetically this etymology is unconvincing. If the gloss cited by Hesychius is cognate, then the alternation would point to a  origin.

Noun

 * 1)  crossbeam of stone in ceiling construction
 * 2) block or sector of seats in a theater
 * 3) rowing bench
 * 4) column of writing in a papyrus roll
 * 5) writing page