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Pronunciation varies by accent · noun
Any of several fossil sponges, of the clade †Stromatoporoidea..
Use stromatoporoid when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Stromatoporoid means Any of several fossil sponges, of the clade †Stromatoporoidea..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use stromatoporoid where its definition matches the intended context.
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