jar1Pronunciation: /dʒɑː/Translate jar | into French | into German | into Italian | into Spanish Definition of jar noun a wide-mouthed cylindrical container made of glass or pottery, especially one used for storing food: [with modifier]:a large storage jar the contents of a jar:a jar of coffee British informal a glass of beer:let’s have a jarDerivatives jarful noun (plural jarfuls)Origin: late 16th century: from French jarre, from Arabic jarrajar in other Oxford dictionaries Definition of jar in the US English dictionary