Relating to or describing the anatomical relationship between the atlas (first cervical vertebra) and the axis (second cervical vertebra) in the spine.
From atloid (atlas-like) + axoid (axis-like), combining the names of the first two neck vertebrae. 'Atlas' comes from Greek mythology (the Titan holding up the sky), while 'axis' is Latin for 'axle.' The suffix '-oid' means 'resembling.'
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