One entry found for flak.
Main Entry: flak
Variant(s): also flack /flak/
Inflected Form(s): plural flakalso flack
Etymology: derived from the German word for "antiaircraft guns," from the first letters of Flieger "flier" and Abwehr "defense" and Kanonen "cannons" 1: antiaircraft guns or the bursting shells fired from them 2: severe criticism