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/ˈʃlɪɹ.ən/ · noun
Regions of a fluid having different refractive index because of their different density..
Use schlieren when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Schlieren means Regions of a fluid having different refractive index because of their different density..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use schlieren where its definition matches the intended context.
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