[guer.ril.la] or gue.ril.la n [Sp guerrilla, fr. dim. of guerra war, of Gmc origin; akin to OHG werra strife--more at war] (1809): a person who engages in irregular warfare esp. as a member of an independent unit carrying out harassment and sabotage
[2]guerrilla adj (1811): of, relating to, or characteristic of guerrillas esp. in being aggressive, radical, or unconventional