• Webster's Revised Unabridged Dictionary
    • n. pl Monorhina (Zoöl) The Marsipobranchiata.
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Century Dictionary and Cyclopedia
    • n monorhina 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.
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Webster's Revised Unabridged Dictionary
NL., fr. Gr. mo`nos single + , , nose