staircase

staircase is a   Noun

Definition:

[1] A flight of stairs with their supporting framework, casing, balusters, etc. To make a complete staircase is a curious piece of architecture. Sir H. Wotton. Staircase shell. (Zoöl.) (a) Any scalaria, or wentletrap. (b) Any species of Solarium, or perspective shell.

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