submersible

adj

1. Able to be submerged.

noun

1. (UK)A small nonmilitary, nonnuclear submarine for exploration.
2. (UK)A retroactive term used for nonnuclear submarines; nuclear submarines are termed true submarines.
3. (UK)A term used primarily by some navies for nuclear submarines, termed true submersibles, because they cannot retroactively declare that their nonnuclear submarines should be called by a different name.
4. (US)A very small baby submarine designed for specific localized missions, usually while tethered to a submarine or ship for life support and communications.
5. An underwater vehicle with limited mobility, similar to a submarine, but less mobile.