![nudibranch nudibranch](https://www.tekportal.net/wp-content/uploads/2018/11/nudibranch.jpg)
noun
- a shell-less, marine snail of the suborder Nudibranchia, having external, often branched respiratory appendages on the back and sides.
noun
- any marine gastropod of the order Nudibranchia, characterized by a shell-less, often beautifully coloured, body bearing external gills and other appendagesAlso called: sea slug
- See sea slug.