round-mouth
Zoology
noun
A vertebrate of the subclass Cyclostomata, which comprises the jawless fishes such as lampreys; a cyclostome.
- Chiefly as a gloss of the words cyclostome or Cyclostomata..
Origin
Mid 19th century.
- backflip
- backflow
- back focus
- back-formation
- back forty
- back four
- backgammon
- back green
- background
- backgrounder
- background music
- background noise
- background radiation
- backhand
- backhanded
- backhander
- backhaul
- back-heel
- backhoe
- backhoe loader
- backing
- backing dog
- backing store
- backing track
- back in the day