, a term in geometry and optics, signifying the crossing of any two lines or rays &c: or the action itself of crossing.
The rays of light decussate in the chrystalline, before they reach the retina.
Many of the lines of the 3d order decussate themselves. See Newton's Enumeratio, &c.
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Entry taken from A Mathematical and Philosophical Dictionary, by Charles Hutton, 1796.
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