n ( AmE )
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 .
MASON JAR
Meaning of MASON JAR in English
Oxford guide to British and American culture English vocabulary. Руководство по британской и американской культуре, Оксфордский английский словарь. 2005