AOR may refer to:
Aortic dissection occurs when a tear in the inside of the aorta causes blood to flow between the layers of the wall of the aorta, forcing the layers apart.
Aortic stenosis (AS or AoS) is the narrowing of the exit of the left ventricle of the heart (where the aorta begins), such that problems result.
The aorta (/eɪˈɔːrtə/) is the main artery in the human body, originating from the left ventricle of the heart and extending down to the abdomen, where it splits into two smaller arteries (the common iliac arteries).
An aortic aneurysm is an enlargement (dilation) of the aorta to greater than 1.5 times normal size. They usually cause no symptoms except when ruptured.
Aortic insufficiency (AI), also known as aortic regurgitation (AR), is the leaking of the aortic valve of the heart that causes blood to flow in the reverse direction during ventricular diastole, from the aorta into the left ventricle.
In the grammar of Ancient Greek, including Koine, the aorist (pronounced /ˈeɪ.ərᵻst/ or /ˈɛərᵻst/) is a class of verb forms that generally portray a situation as simple or undefined, that is, as having perfective aspect.
Aoraki / Mount Cook is the highest mountain in New Zealand. Its height since 2014 is listed as 3,724 metres (12,218 feet), down from 3,764 m (12,349 ft) before December 1991, due to a rockslide and subsequent erosion.
Aortic valve replacement is a procedure in which a patient's failing aortic valve is replaced with an artificial heart valve.
Aorist (/ˈeɪ.ərᵻst/; abbreviated AOR) verb forms usually express perfective aspect and refer to past events, similar to a preterite.