An informal or dialectal term for goldfish, or a small golden-colored fish.
From 'gold' + 'finny' (combining form from 'fin' + '-y' suffix). This appears to be a regional or colloquial variant of 'goldfish' used in some English dialects.
Regional variations like 'goldfinny' show how languages evolve differently in different places—British and American English have entirely different informal animal names!
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