metalfins
nounUK /ˈmɛtəl fɪnz/
US /ˈmɛtəl fɪnz/
Metal fins are hard, shiny parts shaped like fish fins that help things move through water.
The toy submarine had little metalfins on its sides.
RELATED WORDS
OTHER MEANINGS
2. Stiff metal pieces on a rocket or bomb that help it fly straight.
The rocket's metalfins kept it steady as it flew up.
3. Cooling metal flaps on a machine that let heat escape.
The old radio had metalfins on the back to keep it from getting too hot.
4. A nickname for a person who swims with metal swim fins.
The lifeguard called the speedy swimmer 'Metalfins' for fun.