Word Study
escalator
CIDE DICTIONARY
escalator, n. [NL. Cf. Escalade.].
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; -- originally a trade term, which has become the generic name for such devices. Such devices are in common use in large retail establishments such as department stores, and in public buildings having a heavy traffic of persons between adjacent floors. [Webster 1913 Suppl.]
OXFORD DICTIONARY
escalator, n. a moving staircase consisting of a circulating belt forming steps.
Etymology
f. the stem of escalade 'climb a wall by ladder' + -ATOR
ROGET THESAURUS
escalator
Elevation
N elevation, raising, erection, lift, sublevation, upheaval, sublimation, exaltation, prominence, lever, crane, derrick, windlass, capstan, winch, dredge, dredger, dredging machine, dumbwaiter, elevator, escalator, lift, elevated, stilted, attollent, rampant, on stilts, on the shoulders of, on one's legs, on one's hind legs.For further exploring for "escalator" in Webster Dictionary Online