loosely descriptive of the hearts electrical axis when this is directed at approximately +60°. As a cardiac electrical position, recognized in the electrocardiogram when the QRS complex in lead aVF resembles V6 whereas that in aVL is small algebraically or absolutely.
an electric "position" of the heart that lies between the intermediate and vertical positions when the QRS axis is 60 degrees.
sem·i·ver·ti·cal heart(sem'ē-vĕr'ti-kăl hahrt)
Descriptive of the heart's electrical axis when this is directed at approximately +60 degrees.