flask

noun

ˈflask How to pronounce flask (audio)
ˈfläsk
Synonyms of flasknext
: a container often somewhat narrowed toward the outlet and often fitted with a closure: such as
a
: a broad flattened necked vessel used especially to carry an alcoholic beverage on the person
b
British : thermos

Examples of flask in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
She was buried with objects such as jet hairpins, a group of rare glass flasks, and other grave goods. — Maria Mocerino, Interesting Engineering, 17 May 2026 Push a button on either and the sliders grasp smaller flasks. — James Raia, Mercury News, 24 May 2026 Tommy is sober; Jeff’s a wisecracking alcoholic who seems to have twice emptied out a flask before the first scene is over. — Chris Willman, Variety, 27 May 2026 This clip-on sleeve holds a soft 17-fluid-ounce flask but has been engineered to attach easily to your backpack straps for hands-free drinking on the move. — Chris Haslam, Wired News, 24 May 2026 See All Example Sentences for flask

Word History

Etymology

Middle French flasque powder flask, ultimately from Late Latin flascon-, flasco bottle, probably of Germanic origin; akin to Old High German flaska bottle

First Known Use

1549, in the meaning defined above

Time Traveler
The first known use of flask was in 1549

Phrases Containing flask

Rhymes for flask

See All Rhymes for flask

Browse Nearby Words

flashy
flask
flasker
See all Nearby Words

Cite this Entry

“Flask.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/flask. Accessed 7 Jul. 2026.

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Kids Definition

flask

noun
ˈflask How to pronounce flask (audio)
: a container shaped like a flattened bottle

Medical Definition

flask

1 of 2 noun
ˈflask How to pronounce flask (audio)
: a container often somewhat narrowed toward the outlet and often fitted with a closure: as
a
: any of various usually blown-glass vessels used for technical purposes in a laboratory
b
: a metal container in which the materials used to form a dental restoration (as a denture) are processed

flask

2 of 2 transitive verb
: to place (a denture) in a flask for processing

More from Merriam-Webster on flask

Thesaurus: All synonyms and antonyms for flask

Nglish: Translation of flask for Spanish Speakers

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