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Pronunciation varies by accent · noun
A nonlinear optical effect seen in certain crystals and other materials that respond to light by altering their refractive index..
Use photorefraction when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Photorefraction means A nonlinear optical effect seen in certain crystals and other materials that respond to light by altering their refractive index..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use photorefraction where its definition matches the intended context.
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