• Webster's Revised Unabridged Dictionary
    • n Refringency The power possessed by a substance to refract a ray; as, different substances have different refringencies .
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Century Dictionary and Cyclopedia
    • n refringency The power of a substance to refract a ray; refringent or refractive power.
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Chambers's Twentieth Century Dictionary
    • n Refringency refractive power
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In literature:

The mineral has a high refractive index, and strong bi-refringence.
"Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 4" by Various

In science:

Visser, “Refringence, field theory, and normal modes”, Class.
Analogue spacetime based on 2-component Bose-Einstein condensates