1. Relating to both front and rear. 2. In x-ray imaging, describing the direction of the beam through the patient (projection) from anterior to posterior, e.g., an A-P projection of the abdomen; or the direction of view (A-P view) when a film is viewed as if facing the patient (anterior to posterior) regardless of projection.
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an·tero·pos·te·ri·or -pō-'stir-ē-ər, -pä- adj concerned with or extending along a direction or axis from front to back or from anterior to posterior
an·tero·pos·te·ri·or·ly adv
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an·tero·pos·te·ri·or (an″tər-o-pos-tērґe-ər) from front to back of the body, such as the direction of a radiographic projection.Medical dictionary. 2011.