Nudibranch, a member of the order Nudibranchia of opisthobranch gastropods
Opisthobranchia, a common name that is also applied to a very large group of heterobranch gastropod mollusks, which includes the nudibranchs, sea hares, Sacoglossans and others, some of which have reduced shells, and many of which are shell-less
Other groups of shell-less or reduced-shell marine gastropods, including the sorbeoconch family Carinarioidea and the pulmonate sea slug family Onchidiidae
Sometimes used to refer to the sea cucumber (especially in translation of the Japanese word namako)
Sea Slug missile, anti-aircraft missiles, as formerly used by the Royal Navy
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