spiriferous
American Heritage Dictionary:
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spi·rif·er·ous
(spī-rĭf'ər-əs) 
adj.
Having a spiral structure or spiral parts.
adj.
Having a spiral structure or spiral parts.
[Probably from New Latin spīrifer : Latin spīra, coil; see spire2 + Latin -fer, -fer.]
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American Heritage Dictionary
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.
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