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Optics, Crystallography. the part of a doubly refracted ray whose velocity within a crystal is the same in any direction.
the plane-polarized ray of light that obeys the laws of refraction in a doubly-refracting crystal Compare double refraction, extraordinary ray


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    [awr-dn-it, -eyt] /ˈɔr dnˌɪt, -ˌeɪt/ noun 1. Mathematics. (in plane Cartesian coordinates) the y-coordinate of a point: its distance from the x-axis measured parallel to the y-axis. /ˈɔːdɪnɪt/ noun 1. the vertical or y-coordinate of a point in a two-dimensional system of Cartesian coordinates Compare abscissa See also Cartesian coordinates adj. late 14c., from Latin […]

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