axis is a topic covered in the Taber's Medical Dictionary.

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pl. axes [L. axis, axle, axis]

1. A real or imaginary line that runs through the center of a body or about which a part revolves.
2. The second cervical vertebra (epistropheus). It bears the odontoid process (dens), about which the atlas rotates.
SYN: SEE: odontoid vertebra

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