cyclonite (?sa?kl??na?t) n (Elements & Compounds) a white crystalline insoluble explosive prepared by the action of nitric acid on hexamethylenetetramine; cyclotrimethylenetrinitramine: used in bombs and shells. Formula: C3H6N6O6[C20: from cyclo- + (trimethylene-tri)nit(ramin)e]Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014