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quin·cun·cialalso quin·cunx·ial (kwĭn-kŭn′shəl)
Of, relating to, or forming a quincunx.
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