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An elongated supporting rod or tubule that runs the length of certain flagellate protozoans, frequently projecting out of the posterior end. Single or multiple, filamentous or rigid, they vary with the species but provide as an endoskeletal framework and may function in locomotion as well.
[axo- + G. stylos, pillar]
1. the central supporting structure of an axopodium.
2. a supporting rod running through the body of a trichomonad and protruding posteriorly.