fins
fins
noun
Projecting flat parts on objects for stability, cooling, or propulsion.
"The car's cooling fins prevent overheating."
noun
Flat, thin body parts used by fish for swimming and balance.
"Fish use their fins to swim quickly."
verb
To equip something with fins, or to move using fins.
"The diver fins through the water effortlessly."
Thesaurus
Synonyms: tailfin, tail fin, louvre, louver, break water, cinque, five, quintuplet, V, quint, quintet, Little Phoebe