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Pronunciation varies by accent · noun
(science fiction) A fictional material usually described as having an extremely high density..
Use collapsium when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Collapsium means (science fiction) A fictional material usually described as having an extremely high density..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use collapsium where its definition matches the intended context.
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