1. superlative form of finny; having the most fins or most resembling fins
Usage: informal; comparative form is 'finnier'

Examples

• The finniest fish in the aquarium was the lionfish with its elaborate, flowing fins.
• Of all the creatures in the tank, the pufferfish looked the finniest when fully inflated.
• She chose the finniest specimen for her marine biology project.
• The finniest part of a fish's body helps it navigate through water.
• Among the tropical fish, the angelfish was considered the finniest and most graceful.