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Pronunciation varies by accent · noun
(geology) A period during which there was very little free oxygen in the environment, and many organisms became extinct.
Use superanoxia when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Superanoxia means (geology) A period during which there was very little free oxygen in the environment, and many organisms became extinct.
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use superanoxia where its definition matches the intended context.
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