'Pildia' definitions:

Definition of 'Pildia'

From: GCIDE

Pilidium \Pi*lid"i*um\, n.; pl. Pildia. [NL., fr. Gr. ?, dim. of ? a cap.] (Zool.) 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. [1913 Webster]