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from the GNU version of the Collaborative International Dictionary of English

  • The lowest class of Vertebrata, including only the Amphioxus. The heart is represented only by a simple pulsating vessel. The blood is colorless; the brain, renal organs, and limbs are wanting, and the backbone is represented only by a simple, unsegmented notochord. See amphioxus.

from The Century Dictionary and Cyclopedia

  • Same as Leptocardii.


Sorry, no etymologies found.


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