One of the mysteries of the English language finally explained.
Any of the unpaired fins in the midline of a fish's body, i.e. a dorsal, anal, or caudal fin.
- ‘But the first thing he saw as he surfaced was not a dolphin but the vertical fin of a great white.’
- ‘At hatching the larvae are quite advanced with pigmented eyes, well-developed jaws, digestive tracts, and vertical fin folds.’
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