ESCALATOR
escalator, moving staircase, moving stairway
(noun) a stairway whose steps move continuously on a circulating belt
Source: WordNet® 3.1
Etymology
Noun
escalator (plural escalators)
Anything that escalates.
A motor-driven mechanical device consisting of a continuous loop of steps that automatically conveys people from one floor to another.
An upward or progressive course.
An escalator clause.
Anagrams
• acetarsol, crotalase
Source: Wiktionary
Es"ca*la`tor, n. [NL. Cf. Escalade.]
Definition: A stairway or incline arranged like an endless belt so that the
steps or treads ascend or descend continuously, and one stepping upon
it is carried up or down; -- a trade term.
Source: Webster’s Unabridged Dictionary 1913 Edition