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Rachis

//ˈɹeɪkɪs// noun

Definitions

Noun
  1. 1
    The spinal column, or the vertebrae of the spine. obsolete
  2. 2
    the series of vertebrae forming the axis of the skeleton and protecting the spinal cord wordnet
  3. 3
    An anatomical shaft or axis in a marine invertebrate.

    "In some squid species, the pen rachis flares out into wings on either side, and the tip of the rachis grows into a thick cone."

  4. 4
    axis of a compound leaf or compound inflorescence wordnet
  5. 5
    The central shaft of a feather.
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  1. 6
    The axis of either a compound leaf, inflorescence, or fern frond.

Etymology

From New Latin rachis, from Ancient Greek ῥάχις (rhákhis, “spine, ridge”).

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