A type of naval mine shaped like or containing a spherical charge, designed to explode when hit by a ship.
From 'ball' (spherical shape) + 'mine' (explosive device). Developed during the 19th and 20th centuries as naval warfare technology advanced.
Ballmines were the underwater equivalent of ancient caltrops—drop them in a harbor and any ship unfortunate enough to touch one would be blown to pieces.
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