• (British, America) IPA: /ˈɹeɪkɪs/

rachis (plural rachises)

  1. (obsolete, zoology, anatomy) The spinal column, or the vertebrae of the spine. [17th-19th c.]
  2. (zoology) An anatomical shaft or axis in a marine invertebrate. [from 18th c.]
  3. (ornithology) The central shaft of a feather. [from 19th c.]
  4. (botany) The main shaft of either a compound leaf, head of grain, or fern frond. [from 19th c.]
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