barrel
noun [ C ]
uk/ˈbærəl/ usa large container, made of wood, metal, or plastic, with a flat top and bottom and curved sides that make it fatter in the middle
MEASURES
a unit of measure for dry goods and liquids that varies in size for different things and in different countries:
A barrel of beer in the US is 31 US gallons, and in the UK it is 36 UK gallons.
MEASURES
a unit of measure for oil equal to 42 US gallons or 159 litres:
Today oil prices reached $81 a barrel on the New York Mercantile Exchange.