D defs.my
Entry 2 senses Webster, 1913

Quincuncial

· Quin·cun·cial · IPA /kwɪnˈkʌnʃəl/
01 Having the form of a quincunx.
  1. 1.
    Having the form of a quincunx.
  2. 2.
    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 æstivation.(Bot.)
Phrases & compounds
Quincuncial phyllotaxy — an arrangement of five leaves in a spiral, each leaf two fifths of a circle from the next.