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

In the vehicle procession, Maeve sips from a flask, while Kev, Bella (Lara Pulver), and Eddie argue. —Matt Cabral, EW.com, 27 Apr. 2025

So in 1952 a young chemist named Stanley Miller filled a flask halfway with water, topped it with methane, ammonia and hydrogen to mimic the planet’s early atmosphere and then flung a miniature lightning bolt into that fertile soup. —Cody Cottier, Scientific American, 14 Mar. 2025

The Steinbeck plaque was face up in a metal contraption called a casting flask. —Michael Schulman, The New Yorker, 24 Feb. 2025

This 18-ounce hydration flask, on the other hand, is perfect for travel. —Carin Ryan, Travel + Leisure, 12 Feb. 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