pilidium

Pilidium

Pi*lid"i*um\, n.; pl. Pildia. [NL., fr. Gr. ?, dim. of ? a cap.] (Zo["o]l.) The free-swimming, hat-shaped larva of certain nemertean worms. It has no resemblance to its parent, and the young worm develops in its interior.
Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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