n. A flight of stairs with their supporting framework, casing, balusters, etc. [ 1913 Webster ]
To make a complete staircase is a curious piece of architecture. Sir H. Wotton. [ 1913 Webster ]
Staircase shell. (Zool.) (a) Any scalaria, or wentletrap. (b) Any species of Solarium, or perspective shell. [ 1913 Webster ]