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spiroid

[spahy-roid]
adjective
  1. more or less spiral; resembling a spiral.
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Origin of spiroid

1840–50; < New Latin spīroīdēs < Greek speiroeidḗs. See spiro-2, -oid
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for spiroid

spiroid

adjective
  1. resembling a spiral or displaying a spiral form
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Word Origin

C19: from New Latin spīroīdēs, from Greek speiroeidēs, from speira a coil
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012