What is (a) The surface described by the circumference of a circle revolving about a straight line in its own plane. (b) The solid inclosed by such a surface; -- sometimes called an anchor ring called?

tore — (Geom.) (a) The surface described by the circumference of a circle revolving about a straight line in its own plane. (b) The solid inclosed by such a surface; -- sometimes called an anchor ring. (Webster's 1913.)

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