flask

noun

ˈflask 

ˈfläsk

: 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

Once this process is completed, the flask uses high amounts of pressure to infuse water with fresh hydrogen. —Bianca Salonga, Forbes.com, 6 Aug. 2025

Accessories include a flask and luggage tag set, Glencairn set, decanter set, tote bag, golf flask and golf bag, exclusively available at bushmills.com. —Chris Perugini, Forbes.com, 17 July 2025

The tearoom, operating during Prohibition, likely doubled as a speakeasy, and visitors probably brought flasks of illicit alcohol with them to use in mixed drinks, Faderman says. —Kellie B. Gormly, Smithsonian Magazine, 26 June 2025

Pack a small flask of Yellowstone Select to toast to the day’s catch. —Corey Buhay, Outside Online, 2 June 2025

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

Phrases Containing flask

• Erlenmeyer flask
• Florence flask
• hip flask
• vacuum flask

Rhymes for flask

• ask
• bask
• basque
• cask
• casque
• mask
• masque
• pasch
• task
• subtask
• unmask

Kids Definition

flask

noun

ˈflask 

: a container shaped like a flattened bottle

Medical Definition

flask

1 of 2 noun

ˈflask 

: 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