a. [UN-1 7.] Insubmergible.
1806. L. Lukin (title), The Invention, Principles of Construction, and Uses of Unimmergible Boats.
1809. Naval Chron., XXI. 299. To make it … unimmergible,… casks … were ranged along.
1823. Blackw. Mag., XIV. 303. They met with an unimmergible buoyancy in this case.
