Quin-cūn'cial, a.

(-shal), a. [Lat. quincuncialis, from quincunx. See infra.]

1. Having the form of a quincunx.
2. (Bot.) Having five leaves in a floral whorl, in estivation, so arranged that two are exterior, two wholly interior, and the fifth has one edge out and the other in;—said of a flower.