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Pronunciation varies by accent · adjective
Having pores of a size considerably less than a nanometre.
Use ultramicroporous when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Ultramicroporous means Having pores of a size considerably less than a nanometre.
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use ultramicroporous where its definition matches the intended context.
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