jar

¹ American  

[jahr] / dʒɑr /

noun

1. a broad-mouthed container, usually cylindrical and of glass or earthenware.

   a cookie jar.

2. the quantity such a container can or does hold.

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jar ² American  

[jahr] / dʒɑr /

verb (used without object)

jarred, jarring

1. to have a harshly unpleasant or perturbing effect on one's nerves, feelings, thoughts, etc..

   The sound of the alarm jarred.

2. to produce a harsh, grating sound; sound discordantly.

3. to vibrate audibly; rattle.

   The window jarred in the frame.

4. to vibrate or shake.

5. to conflict, clash, or disagree.

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verb (used with object)

jarred, jarring

1. to cause to rattle or shake.

2. to have a sudden and unpleasant effect upon (the feelings, nerves, etc.).

   The burglary violently jarred their sense of security.

3. to cause to sound harshly or discordantly.

noun

1. a jolt or shake; a vibrating movement, as from concussion.

2. a sudden unpleasant effect upon the mind or feelings; shock.

3. a harsh, grating sound.

4. a discordant sound or combination of sounds.

5. a quarrel or disagreement, especially a minor one.

jar ³ American  

[jahr] / dʒɑr /

noun

1. a turn or turning.

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idioms

1. on the jar, partly opened; ajar.

   The window was on the jar.

jar ¹ British  

/ dʒɑː /

verb

1. to vibrate or cause to vibrate

2. to make or cause to make a harsh discordant sound

3. (often foll by on) to have a disturbing or painful effect (on the nerves, mind, etc)

4. (intr) to disagree; clash

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noun

1. a jolt or shock

2. a harsh discordant sound

jar ² British  

/ dʒɑː /

noun

1. a wide-mouthed container that is usually cylindrical, made of glass or earthenware, and without handles

2. Also: jarful.  the contents or quantity contained in a jar

3. informal a glass of alcoholic drink, esp beer

   to have a jar with someone

4. obsolete a measure of electrical capacitance

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jar ³ British  

/ dʒɑː /

noun

1. (of a door) slightly open; ajar

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Other Word Forms

• jarless adjective
• jarring adjective
• jarringly adverb
• unjarred adjective

Etymology

Origin of jar¹

First recorded in 1585–95; Middle English jarre “liquid measure smaller than a barrel,” possibly from Old French jarre, from Spanish or Portuguese jarra, jarro “a jar, pitcher,” or from Medieval Latin jarra, from Old Provençal jarra, from Arabic jarrah “earthen water vessel”

Origin of jar²

First recorded in 1520–30; probably imitative; chirr

Origin of jar³

First recorded in 1665–75; variant of char ³; ajar ²

Explanation

A jar is a smooth-sided, round container that's often made of glass. Jars are useful for storing food, from rice to tea bags to cookies. A wide-mouth jar made of pottery might hold Oreos, and a small, short jar could contain homemade jam. When you put something in a jar, you jar it. Another way to use the verb version of jar is to mean "shock painfully or unpleasantly:" "Every bump we drove over in the old Jeep would jar my whole body." The jar that's a container probably stems from the Middle French jarre, "liquid measure."

Example Sentences

Carney was referring to a viral image of a jar of nutella floating through the Orion space capsule, and his question had the crew in fits of laughter.

From Barron's • Apr. 9, 2026

When arguing for punitive damages against the tech companies, Lanier held up a jar of 415 M&Ms to show how a $1 billion fine would be a fraction of Alphabet’s $415 billion in shareholder equity.

From The Wall Street Journal • Mar. 28, 2026

“Not lawyer arguments, not props like a glass of water or a jar of M&Ms, But actual proof in evidence.”

From Los Angeles Times • Mar. 25, 2026

I left a note with a jar of honey.

From MarketWatch • Mar. 20, 2026

I peered into the jar of what looked like baby diarrhea and then jerked away.

From "Liar, Liar" by Gary Paulsen

Related Words

• basin
• bottle
• can
• flask
• jug
• pot
• urn
• vase
• vessel