Relating to both the front and back aspects; often used in medical imaging to describe the direction or axis of a scan or measurement.
From 'antero-' (front) and 'posterior' from Latin 'posterus' (coming after, back). Combined to describe the full front-to-back dimension.
An 'AP chest X-ray' is taken from front to back—it's the standard hospital image because it's what most organs look like at their widest, giving doctors the clearest picture!
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