finny
adjective
fin·ny ˈfi-nē 
1
: provided with or characterized by fins
2
: relating to or being fish
Example Sentences
Recent Examples on the Web Kid gloves in hand, Tony Owens and his crew are anxiously awaiting their first finny customer of 2020. 
Matt Williams, Dallas News, 18 Jan. 2020 Do you have a water garden, complete with koi or other tropical fish? This hot weather can damage them — the finny equivalent of being locked in the car. Margaret Lauterbach, idahostatesman, 26 July 2017
Matt Williams, Dallas News, 18 Jan. 2020 Do you have a water garden, complete with koi or other tropical fish? This hot weather can damage them — the finny equivalent of being locked in the car. Margaret Lauterbach, idahostatesman, 26 July 2017 Word History
First Known Use
1590, in the meaning defined at sense 1