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Pronunciation varies by accent · noun
A substance that generates an allergic response in the presence of light.
Use photoallergen when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Photoallergen means A substance that generates an allergic response in the presence of light.
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use photoallergen where its definition matches the intended context.
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