V flask (or V-flask) Share definition Flag (chemistry term) short form for volumetric flask Pour 250 ml of muriatic acid into a 250 ml V flask (or V-flask). V flask (or V-flask) by crashtestsdatabase April 12, 2014 0 0 Get merch Get the V flask (or V-flask) mug. Buy Now — $32.95 See more merch