Tubeworm meaning

to͝obwûrm, tyo͝ob-
Any of various chiefly marine worms or wormlike invertebrates of the phyla Annelida and Phoronida that live inside tubular cases made of chitinous or calcareous secretions or of particles of sand or mud.
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(biology) Any of many marine polychaete worms, mostly of the family Serpulidae, which construct permanent calcareous tubes on rocks, ship bottoms etc.
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