AO

• abdominal aorta;

• abdominally obese;

• achievement orientation;

• acid output;

• acridine orange;

• adult onset;

• age of onset;

• ankle orthosis;

• anodal opening;

• anterior oblique;

• antisense oligonucleotide;

• aorta;

• aortic opening;

• arthro-ophthalmopathy;

• assessment-object;

• atelosteogenesis;

• atomic orbital;

• atrioventricular [valve] opening;

• average optical [density];

• axio-occlusal