Pectoral fin

/pˈɛktəɹəl fˈɪn/

/pˈɛktɚɹəl fˈɪn/

Pectoral fin

a paired, wing-like appendage located on the sides of the body of fish, used for stability, maneuverability, and generating lift during swimming

Examples

1. Pectoral fins are right here.

2. He actually puts his pectoral fin underneath me.

3. Some had vertical fins on their tails and backs, for instance, and larger pectoral fins in front for propulsion.

4. So instead of the typical side-to-side wiggle, they have large pectoral fins to generate forward propulsion.