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• Mason jar
  Mason jar

  noun

  a glass jar with a wide mouth and an airtight screw top, much used in home canning.
• mason jar
  mason jar

  noun

  an airtight glass jar for preserving food

Mason jar

American  

noun

1. a glass jar with a wide mouth and an airtight screw top, much used in home canning.

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mason jar British  

noun

1. an airtight glass jar for preserving food

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Etymology

Origin of Mason jar

1880–85, named after John L. Mason, 19th-century American who patented it in 1858

Example Sentences

I put a big Mason jar in front of a coffee maker before I go to bed—I use that as a visual cue to delay coffee for an hour and drink water first.

From The Wall Street Journal • Feb. 16, 2026

Place the fine-cut chard stems in a Mason jar or other heatproof narrow container.

From Seattle Times • Feb. 9, 2024

And she shows up with this Mason jar.

From Los Angeles Times • May 12, 2023

I’ll be the one with a Mason jar.

From Washington Post • Apr. 20, 2023

Theo was kneeling outside the classroom door, mixing condiments inside a Mason jar, while Miles stood next to her with his arms crossed.

From "Made You Up" by Francesca Zappia