pilidium

noun pi·lid·i·um \pīˈlidēəm\

Definition of pilidium

plural

pilidia

\-ēə\
  1. :  the free-swimming hat-shaped larva of various nemertean worms in whose interior the young worm develops

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Origin and Etymology of pilidium

New Latin, from Greek pilidion, diminutive of pilos felt cap (hair)


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