The Collaborative International Dictionary
Quincuncial \Quin*cun"cial\, [L. quincuncialis, from quincunx. See Quincunx.]
Having the form of a quincunx.
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(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.
Quincuncial phyllotaxy (Bot.), an arrangement of five leaves in a spiral, each leaf two fifths of a circle from the next.
Wiktionary
a. 1 Arranged in a quincunx. 2 (context botany English) Having the leaf 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.
Usage examples of "quincuncial".
Heralds have not omitted this order or imitation thereof, while they Symbollically adorn their Scuchions with Mascles, Fusils, and Saltyrs, and while they dispose the figures of Ermins, and vaired coats in this Quincuncial method.
The public at large, pedestrians and pederasts, goldfish and spun-glass palm trees, donkeys sobbing, all circulating freely through quincuncial alleys.