watering-pot shell
noun
: any of several marine bivalve mollusks (genus Brechites) having small valves consolidated with a capacious calcareous tube which encases the entire animal and is closed at the anterior end by a convex disk perforated by many pores like the nozzle of a watering pot
also
: the shell of such a mollusk
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Merriam-Webster unabridged
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