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Pronunciation varies by accent · noun
The reversible transformation of the optical properties of a material when exposed to electromagnetic radiation, especially the reversible darkening of a plastic lens when exposed to sunlight..
Use photochromism when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Photochromism means The reversible transformation of the optical properties of a material when exposed to electromagnetic radiation, especially the reversible darkening of a plastic lens when exposed to sunlight..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use photochromism where its definition matches the intended context.
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