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From The Collaborative International Dictionary of English v.0.48:
Quincunx \Quin"cunx\, n. [L., fr. quinque five + uncia an ounce. The quincunx was marked by five small spots or balls. See Five, and Ounce the weight.] 1. An arrangement of things by fives in a square or a rectangle, one being placed at each corner and one in the middle; especially, such an arrangement of trees repeated indefinitely, so as to form a regular group with rows running in various directions. [1913 Webster] 2. (Astrol.) The position of planets when distant from each other five signs, or 150[deg]. --Hutton. [1913 Webster] 3. (Bot.) A quincuncial arrangement, as of the parts of a flower in [ae]stivation. See Quincuncial, 2. [1913 Webster]