uropod
/ˈjʊrəpɑd/
noun
- One of the paired appendages at the rear end of a crustacean (such as a shrimp or lobster), used for swimming or steering.
- When threatened, a lobster fans its uropod to create a current and escape.
- The shrimp used its uropod to dart backward through the water.
- The biologist pointed out the uropod on the crayfish during the dissection.