staircase : Idioms & Phrases
Geometrical staircase
- one in which the stairs are supported by the wall at one end only.
Webster 1913
moving staircase
-
noun a stairway whose steps move continuously on a circulating belt
moving stairway; escalator.
WordNet
Staircase shell
- .
(Zoöl.) (a) Any scalaria, or wentletrap .(b) Any species of Solarium, or perspective shell.
Webster 1913
Well staircase
(Arch.) , a staircase having a wellhole (seeWellhole (b) ), as distinguished from one which occupies the whole of the space left for it in the floor.