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

Mason jar

noun
 
/ˈmeɪsn dʒɑː(r)/
 
/ˈmeɪsn dʒɑːr/
(North American English)
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  1. a glass container with a wide opening and a metal top that screws on tightly, used for preserving fruit and vegetables, especially in the home compare Kilner jar™
    Word Originlate 19th century: named after John L Mason, who invented it in 1858.
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