RACHIS

Rachis

Rachis is a biological term for a main axis or "shaft". In vertebrates a rachis can refer to the series of articulated vertebrae, which encase the spinal cord. In this case the rachis usually forms the supporting axis of the body and is then called the spine or vertebral column. Rachis can also mean the central shaft of pennaceous feathers.

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rachis

Noun

  1. The main shaft of either a compound leaf, head of grain, or fern frond.
  2. The spine or the vertebrae of the spine.
  3. The central shaft of a feather.


The above text is a snippet from Wiktionary: rachis
and as such is available under the Creative Commons Attribution/Share-Alike License.

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