Axis

—1. The straight line, real or imaginary, pa ing through a body on which it revolves, or may be supposed to revolve. 2. A straight line with respect to which the different parts of a magnitude are symmetrically arranged; as, the axis of a cylinder, i. e., the straight line joining the centers of the two ends; the axis of a cone, i. e., the straight line joining the vertex and the center of the base; the axis of a circle, any straight line pa ing through the center. Plural, azes.