quincuncial adjective. [kwɪn'kʌnʃ(ǝ)l] E17.
[Latin quincuncialis, formed as QUINCUNX + -AL¹.]
1. (Esp. of a tree plantation) arranged in the form of a quincunx or quincunxes; involving or characterized by this arrangement. E17.

2. Botany. Of aestivation: having five perianth segments imbricated in such a way that two are exterior and two interior, while the fifth is partly exterior and partly interior. M19.

■ quincuncially adverb M17.

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