any of an order (Nudibranchia) of marine gastropods without a shell and with external gills
Origin of nudibranchfrom Modern Latin Nudibranchia: see nudi- and branchiae
See sea slug.
Origin of nudibranchFrom New Latin Nūdibranchia order name nudi- branchia
- A term for any sea slug; specifically the animals belonging to the suborder Nudibranchia, a clade within the informal group Opisthobranchia.