OR

a logical binary relation that is true if any argument is true, and false otherwise; [o]estrogen receptor; odds ratio; oil retention [enema]; oligomer of resveratrol; open reduction; open repair; operating room; optic radiation; oral rehydration; orbicularis oris [muscle]; orosomucoid; orthopedic; orthopedic research; ouabainresistant; outwardly rectifying [current]; oxidized radical

* * *

OR abbr operating room