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airstair

noun
air·​stair | \ ˈer-ˌster How to pronounce airstair (audio) \
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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First Known Use of airstair

1960, in the meaning defined above

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The first known use of airstair was in 1960

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