spiriferous
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spi·rif·er·ous
(spī-rĭf′ər-əs)adj.
Having a spiral structure or spiral parts.
[Probably from New Latin spīrifer : Latin spīra, coil; see spire2 + Latin -fer, -fer.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.