Artificial intelligent assistant

rachial

rachial, a.
  (ˈreɪkɪəl)
  [f. rachi-s + -al1.]
  Characterized by a rachis.

1848 Macdonald in Proc. Zool. Soc. 140 The Rachidian development..is the longest, and forms the Rachial type.

Oxford English Dictionary

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