cav-, cavo-, cava-, cavi-, cavern-
(Latin: hollow, a hollow place; chasm; prison)
2. Situated or occurring within a body cavity; especially, relating to, or being treatment (as of cancer) characterized by the insertion of radioactive substances in a cavity.
2. A place for the confinement of people in lawful detention, especially those awaiting trial under local jurisdiction; detention in a jail.
3. Etymology: From about 1275, gayhol, from Old Normandy French gaiole and Old French jaole, both meaning "a cage, a prison"; from Middle Latin gabiola, from Late Latin caveola, diminutive of Latin cavea, "cage".
Both forms were carried into Middle English; now pronounced "jail"; regardless of how it is spelled. Norman-derived gaol (preferred in Britain) is "primarily a result of statutory and official tradition".
2. Pertaining to or noting a lens that is plane on one side and concave on the other side.
Some of the species are noted for their power of boring holes in limestone and similar rocks.
The cavity (the bubble) reduces the drag on the object and this makes supercavitation an advantageous technology