staircase

UK: /ˈstɛə^rkeɪs/ US: /ˈstɛrˌkeɪs/ ,(stâr′kās′)

WordReference Random House Learner's Dictionary of American English © 2026

stair•case /ˈstɛrˌkeɪs/   n. [countable]

1. Building a flight of stairs with its frame, banisters, etc., or a series of such flights.

WordReference Random House Unabridged Dictionary of American English © 2026

stair•case  (stâr′kās′), n. 

1. Building a flight of stairs with its framework, banisters, etc., or a series of such flights.

• stair + case² 1615–25

Collins Concise English Dictionary © HarperCollins Publishers::

staircase / ˈstɛəˌkeɪs/ noun

1. a flight of stairs, its supporting framework, and, usually, a handrail or banisters