Submersible

Adjective

 * 1) Able to be submerged.

Noun

 * 1)  A small nonmilitary, non-nuclear submarine for exploration.
 * 2)  A retroactive term used for non-nuclear submarines; nuclear submarines are termed "true submarines".
 * 3)  A term used primarily by some navies for nuclear submarines, termed "true submersibles", because they cannot retroactively declare that their non-nuclear submarines should be called by a different name.
 * 4) 🇺🇸 A very small "baby" submarine designed for specific localized missions, usually while tethered to a submarine or ship for life support and communications. Slang synonyms: midget-submarine, anchor.