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air·stair | \ ˈer-ˌster 
\
\ plural airstairs
Definition of airstair
: a built-in or movable set of stairs that is used to allow people to enter and exit an aircraft
—often plural The plate acted like a gate latch, preventing the airstairs from being lowered in flight.— Steve Martini, The Rule of Nine, 2010
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Merriam-Webster unabridgedWords at Play
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Time Traveler for airstair
The first known use of airstair was in 1960
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