/flɑ:sk; US flæsk ||; flæsk/noun[C] 1 (also Thermos™) (Brit 英) a type of container for keeping a liquid hot or cold 保温瓶
2 a bottle with a narrow neck that is used for storing and mixing chemicals in scientific work 烧瓶（做实验用的细颈瓶） ☞picture at laboratory 见laboratory插图