Opisthobranchia

 
Pronunciation: /əˌpɪsθə(ʊ)ˈbraŋkɪə/

plural noun

Zoology
  • a group of molluscs which includes the sea slugs and sea hares. They have a small or absent shell and are typically brightly coloured with conspicuous external gills.
    • Subclass Opisthobranchia, class Gastropoda

Derivatives

opisthobranch

Pronunciation: /əˈpɪsθə(ʊ)braŋk/
noun

Origin:

modern Latin (plural), from opistho- 'to the rear' + brankhia 'gills'