rachis

Definitions of rachis
  1. noun
    axis of a compound leaf or compound inflorescence
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    type of:
    axis
    the main stem or central part about which plant organs or plant parts such as branches are arranged
  2. noun
    the series of vertebrae forming the axis of the skeleton and protecting the spinal cord
    synonyms: back, backbone, spinal column, spine, vertebral column
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    types:
    notochord
    a flexible rodlike structure that forms the supporting axis of the body in the lowest chordates and lowest vertebrates and in embryos of higher vertebrates
    chine
    backbone of an animal
    urochord
    a notochord of a larval tunicate typically confined to the caudal region
    type of:
    skeletal structure
    any structure created by the skeleton of an organism
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