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[foh-toh-i-la-stis-i-tee, -ee-la-stis-] /ˌfoʊ toʊ ɪ læˈstɪs ɪ ti, -ˌi læˈstɪs-/

noun, Physics.
the phenomenon of double refraction of polarized light by a transparent substance under elastic stress, used to measure strain in elastic, transparent materials.
the effects of stress, such as double refraction, on the optical properties of transparent materials


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