
Latin word scala comes from Proto-Indo-European *skeh₁i-d-, and later Latin scando (I clamber. I climb, ascend, mount.)
*skeh₁i-d- (Proto-Indo-European)
*skend- (Proto-Indo-European)
scando (Latin)
I clamber. I climb, ascend, mount.
*skand-sla (Latin)
scala (Latin)
(plural only) stairs (flight of steps). Ladder.