Nauplius \Nau"pli*us\, n.; pl. {Nauplii}. [L., a kind of
shellfish, fr. Gr. nay^s ship + ? to sail.] (Zool.)
A crustacean larva having three pairs of locomotive organs
(corresponding to the antennules, antennae, and mandibles), a
median eye, and little or no segmentation of the body.
[1913 Webster]