From Longman Dictionary of Contemporary EnglishMason jarˈMason jar noun [countable] trademark American EnglishDF a glass pot with a tight lid, used for preserving fruit and vegetables SYN Kilner jar British English
Examples from the Corpus
Mason jar• A Mason jar of early wildflowers sat in the center, along with a deep-dish apple pie, fresh from the oven.Origin Mason jar (1800-1900) John L. Mason (died 1902), U.S. inventor 