cask
/kɑːsk/noun
1- a large barrel-like container made of wood, metal, or plastic, used for storing liquids, typically alcoholic drinks（尤指装酒等液体的）大桶。
1.1
- the quantity of liquid held in such a container一桶之量：
a cask of cider.
一桶苹果酒。
词源
early 16th cent.: from French casque or Spanish casco 'helmet'. The current senses appear only in English; from the late 16th to the late 18th centuries the word also denoted a helmet （compare with CASQUE）.