English

Definition of Mason jar noun from the Oxford Advanced Learner's Dictionary

 

Mason jar

 noun
noun
BrE
 
; NAmE
 
(North American English)
 
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a glass container used for preserving food such as fruit, especially in the home. It has a wide opening and a metal lid that screws on tightly. It is named after John L Mason, who invented it in 1858. compare Kilner jar