An alternative or rare spelling of 'cocoon,' the silky protective covering that some insects like caterpillars and spiders spin around themselves.
From Portuguese 'casulo' ultimately from Sanskrit 'kosa' (covering), but 'cacoon' represents an older or variant English spelling found in historical texts before standardization.
English spelling was wildly inconsistent before the 1800s—dictionaries helped standardize words, but variants like 'cacoon' still appear in old literature, showing how spelling evolves like a living thing.
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