Moving stair case

escalator

[es-kuh-ley-ter]
noun
1.
Also called moving staircase, moving stairway. a continuously moving stairway on an endless loop for carrying passengers up or down.
2.
a means of rising or descending, increasing or decreasing, etc., especially by stages: the social escalator.
adjective
4.
of, pertaining to, or included in an escalator clause: The union demands escalator protection of wages.

Origin:
1895–1900, Americanism; formerly a trademark; perhaps escal(ade) + (elev)ator

Dictionary.com Unabridged

moving stairway

noun
escalator ( def 1 ).
Also called moving staircase.


Origin:
1905–10

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
escalator (ˈɛskəˌleɪtə)
 
n
1.  a moving staircase consisting of stair treads fixed to a conveyor belt, for transporting passengers between levels, esp between the floors of a building
2.  short for escalator clause
 
[C20: originally a trademark]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

escalator
1900, Amer.Eng., trade name of an Otis Elevator Co. moving staircase, coined from escalade, a c.1600 borrowing from M.Fr., where it meant "an assault with ladders on a fortification" (from L. scala "ladder") + -ator in elevator. Figurative use is from 1927.
Online Etymology Dictionary, © 2010 Douglas Harper
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