Staircase

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wiktionary

ref 

stair +‎  case


etymonline

ref

staircase (n.)

also stair-case, 1620s, originally the enclosure of the stairs, from stair + case (n.2) in its sense "frame;" compare former window-case, door-case.

取自“https://www.bigphysics.org/index.php?title=Staircase&oldid=23521”