ra·chis /ˈrekəs, ˈræ-/
  脊椎,脊柱,花軸
  Ra·chis n.; pl. E. Rachises L. Rachides   [Written also rhachis.]
  1. Anat. The spine; the vertebral column.
  2. Bot. & Zool. Same as Rhachis.
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  rachis
       n 1: axis of a compound leaf or compound inflorescence
       2: the series of vertebrae forming the axis of the skeleton and
          protecting the spinal cord; "the fall broke his back"
          [syn: spinal column, vertebral column, spine, backbone,
           back]
       [also: rhachises (pl)]