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]
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