'Lancelet' definitions:

Definition of 'lancelet'

(from WordNet)
noun
Small translucent lancet-shaped burrowing marine animal; primitive forerunner of the vertebrates [syn: lancelet, amphioxus]

Definition of 'Lancelet'

From: GCIDE
  • Lancelet \Lance"let\, n. [Lance + -let.] (Zool.) A small fishlike animal (Amphioxus lanceolatus), remarkable for the rudimentary condition of its organs. It is the type of the class Leptocardia. See Amphioxus, Leptocardia. [1913 Webster]