escalator
Concise Oxford English Dictionary © 2008 Oxford University Press:
escalator/ˈeskəleɪtə(r)/
▶noun a moving staircase consisting of a circulating belt of steps driven by a motor.
– origin early 20th cent. (orig. US, as a trade name): from escalade ‘climb a wall by ladder’ (from escalade), on the pattern of elevator.
'escalator' also found in these Oxford entries:
