|Origin:||jarra, from Arabic jarrah 'pot for carrying water'|
a glass container with a wide top and a lid, used for storing food such as jam or honey, or the amount it contains:
a jam jar
half a jar of peanut butter
a container made of clay, stone etc used especially in the past for keeping food or drink in
3 British English informalDFD
a glass of beer:
We'd had a few jars down the pub.