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quin·cun·cialalso quin·cunx·ial (kwĭn-kŭn′shəl)
Of, relating to, or forming a quincunx.
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.
1. consisting of or having the appearance of a quincunx
2. (Botany) (of the petals or sepals of a five-membered corolla or calyx in the bud) arranged so that two members overlap another two completely and the fifth overlaps on one margin and is itself overlapped on the other
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014