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countable and uncountable, plural gelignites
An explosive mixture of nitroglycerine and nitrate absorbed onto a base of wood pulp. quotations examples
Three small gelignite bombs, with pocket watch timing devices, were concealed in packets small enough to fit through the slot of the standard cast-iron post box, the cylindrical bright red colored boxes so common throughout London.
2008, Steven P. Moysey, The Road to Balcombe Street: The IRA Reign of Terror in London, Binghamton, N.Y.: Haworth Press, page 58