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spiny lobster
spiny mouse
spiracle
spiraea
spiral
spiral binding
spiral galaxy
spiral of Archimedes
spiral staircase
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spiral staircase
spi·ral stair·case (plural spi·ral stair·cas·es)


noun 
Definition:
 
staircase around central axis: a staircase that winds around a central axis
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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