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rachis noun

  /ˈɹeɪkɪs/
  • (obsolete, zoology, anatomy) The spinal column, or the vertebrae of the spine. [17th–19th c.]
  • (ornithology) The central shaft of a feather. [from 19th c.]
  • (botany) The axis of either a compound leaf, inflorescence, or fern frond. [from 19th c.]
 rachide
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