An archaic or dialectal word for a female hagfish or a type of sea creature, possibly haggard or emaciated-looking.
Possibly from 'hag' (an ugly old woman) + 'den' (variant of 'fish'), though etymology is uncertain. Obscure regional term with unclear origins.
Some archaic fish names like 'hagden' have been lost to history because they're so regional and obscure—linguistics would be much easier if fishermen had agreed on standard names instead of calling the same creature 30 different things.
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