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1. Oxford American Dictionary

   tube worm

   • IPA[ˈto͞ob ˌwərm]

   • n.
     a marine bristle worm, especially a fan worm, which lives in a tube made from sand particles or in a calcareous tube that it secretes.；a pogonophoran or vestimentiferan worm.

   • noun: tube worm, plural noun: tube worms