A male goose; a gander, especially in dialectal or regional British usage.
From Germanic roots 'gans' (goose) plus the agent suffix '-er', making it literally 'the goose one' or 'the goose creature.' This follows the pattern of '-er' being added to animal names to create variants.
In English, we actually have separate words for male and female versions of some animals—'gander' and 'goose,' 'buck' and 'doe'—which is pretty rare compared to most languages!
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