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From The Collaborative International Dictionary of English v.0.48:
Quincuncial \Quin*cun"cial\, [L. quincuncialis, from quincunx. See Quincunx.] [1913 Webster] 1. Having the form of a quincunx. [1913 Webster] 2. (Bot.) Having the leaves of a pentamerous calyx or corolla so imbricated that two are exterior, two are interior, and the other has one edge exterior and one interior; as, quincuncial [ae]stivation. [1913 Webster] Quincuncial phyllotaxy (Bot.), an arrangement of five leaves in a spiral, each leaf two fifths of a circle from the next. [1913 Webster]