from the GNU version of the Collaborative International Dictionary of English
- n.pl. The Marsipobranchiata.
from The Century Dictionary and Cyclopedia
- n. A primary division of the Vertebrata, or other major group of vertebrates, represented by the Marsipobranchii (Cyclostomi or roundmouths), the lampreys and hags (Hyperotreta and Hyperoartia), in which the nasal passage is single: distinguished from all other cranial vertebrates, or Amphirhina. Also, more correctly, Monorrhina.
Sorry, no etymologies found.