Definition of tubifex worm
: any of a genus (Tubifex) of slender reddish tubificid worms that live in tubes in fresh or brackish water, are widely used as food for aquarium fish, and serve as a host for the protozoan causing whirling disease in fish
— called also tubifex
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Time Traveler for tubifex worm
The first known use of tubifex worm was in 1948
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