1.
[syn: lancelet, amphioxus]
The Collaborative International Dictionary of English v.0.48:
Amphioxus \Am`phi*ox"us\, n. [NL., fr. Gr. 'amfi` + ? sharp.]
(Zool.)
A fishlike creature (Amphioxus lanceolatus), two or three
inches long, found in temperature seas; -- also called the
lancelet. Its body is pointed at both ends. It is the
lowest and most generalized of the vertebrates, having
neither brain, skull, vertebr[ae], nor red blood. It forms
the type of the group Acrania, Leptocardia, etc.
[1913 Webster]
WordNet (r) 3.0 (2006):
amphioxus
n 1: small translucent lancet-shaped burrowing marine animal;
primitive forerunner of the vertebrates [syn: lancelet,
amphioxus]