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electrical axis
1. The direction in a crystal in which electrical resistance is at a minimum.
2. The x axis in a quartz crystal where there are three such axes in a crystal, each parallel to one pair of opposite sides of the hexagon.

All pass through and are perpendicular to the optical or z axis.

3. In electrocardiographic work, it is the direction of the electrical forces in the heart at a given moment in the cardiac cycle.
This entry is located in the following unit: electro-, electr-, electri- (page 16)