Standard Lemma guide
Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.
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noun
A period during which there was very little free oxygen in the environment, and many organisms became extinct
Definition source: English Wiktionary via Wiktextract
Usage: uncountable
Topics: geography, geology, natural-sciences
No example sentence was provided for this meaning.
Synonyms: none provided
Antonyms: none provided
History
From super- + anoxia.
