1. A kind of firework. ? Obs.
1799. G. Smith, Laboratory, I. 22. The water-crackers, or divers are commonly rammed … in cases.
2. A Prince Rupert’s drop.
1887. Sci. Amer., 19 March, 181/1. In this way I have taken a water cracker, as they [Prince Rupert drops] are called in the factory, several feet long, and broken it four or five times.
3. U.S. A water-biscuit.
1891. in Century Dict.
