The abbreviation "AP" in the phrase "AP diameter" means from front to back.
AP diameter of 9mm in the midline means the front-to-back distance in the middle of the structure is less than a half inch.
Test
The AP to the lateral diameter of the chest should be 1:2.
11-16mm
ap supine
ap supine
The prefix ap- mean to or toward. One word with this prefix is appetite.
If you mean the diameter of a circle with area pi, then the diameter is 2. If you mean the diameter of a circle with circumference pi, then the diameter is 2. If you mean the diameter of a circle with diameter pi, then the diameter is pi. If you mean the diameter of a circle with radius pi, then the diameter is 2pi.
AM AP means in the morning before eating.
AP stands for Advanced Placement. An AP course is similar to an honors course, but college credit can be awarded to students who score high enough on an end-of-the-year AP exam.
AP typically stands for anterior-posterior in medical contexts.
'Ap' means 'son of', similar to Irish 'Mac'.