A variant spelling or dialectal form of hagfish or a related sea creature with unclear exact meaning.
Related to 'hagden' and possibly 'hagfish,' from Old Norse 'hagi' (enclosure) + fish-related suffix. Obscure origin reflecting regional variation.
Words like 'hagdin' remind us that many creatures have multiple folk names that were never standardized—modern science had to invent Latin names because fishermen and farmers had created chaotic terminology.
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