noun
also gue·ril·la gəˈrilə
( -s )
Usage: often attributive
Etymology: Spanish guerrilla, literally, small war, diminutive of guerra war, from Old High German werra discord, strife, quarrel — more at war
1. archaic : irregular war carried on by independent bands
2.
a. : one who carries on or assists in an irregular war or engages in irregular warfare in connection with a regular war ; especially : a member of an independent band engaged in predatory excursions in wartime
b. : a member of a military detachment functioning in the rear of enemy lines especially in guerrilla warfare