noun
a fin located on the underside of a fish's body, near the abdomen
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The abdominal fin of the fish helps with stability and maneuverability in the water.
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Check out the cool abdominal fin on this fish - it's like a little rudder!
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That fish's belly fin is wicked awesome, dude!
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Just like a fish needs its abdominal fin to navigate the water, we need our inner strength to navigate life's challenges.