Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Any of various small, flattened marine organisms of the subphylum Cephalochordata, structurally similar to the vertebrates but having a notochord rather than a true vertebral column. Also called amphioxus.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. any of a group of primitive marine animals, of subphylum Cephalochordata, having a notochord instead of a backbone

from the GNU version of the Collaborative International Dictionary of English

  • n. 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.

from The Century Dictionary and Cyclopedia

  • n. A lance.
  • n. The sand-lance, amphioxns, or branchiostome, a skull-less fish-like vertebrate, representing a genus Branchiostoma or Ámphioxus, a family Branchiostomidæ or Á mphioxidæ, an order Pharyngobranchii, a class Leptocardii, and a ‘branch’ of vertebrates lately named Cephalochorda. See these names, and Acrania.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. small translucent lancet-shaped burrowing marine animal; primitive forerunner of the vertebrates

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