zooflagellate

/ˌzoʊəˈflædʒəleɪt/
noun
  1. A single-celled organism that moves using a tail-like structure called a flagellum and lives in water or inside other living things.
    • Some zooflagellates live inside termites and help them digest wood.
    • Under the microscope, the zooflagellate swam quickly through the drop of pond water.
    • The biology class studied a zooflagellate to learn how flagella work for movement.