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rota'tion ax"is

an imaginary line through a crystal about which the crystal may be rotated a specified number of degrees and be brought back to its original position. Also called axis of symmetry, symmetry axis of rotation. Cf. symmetry element.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

rotational quantum numberrotation-inversion axis


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