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

The quantumness involved is simple, fleeting, and kind of unavoidable — even in a flask of dead chemicals, some tiny particles will tunnel through energetic barriers. — Elise Cutts, Quanta Magazine, 23 Sep. 2026

With no single plastics in sight, drinking water aboard Charcot is produced onboard and bottled in glass; guests receive stainless steel flasks for refills. — Condé Nast, Condé Nast Traveler, 9 Sep. 2026

Victoria Beckam’s Portofino ‘97 scent comes in a turquoise flask that can fit in your palm and dangle at your breastplate. — Chloe Schama, Vogue, 1 Sep. 2026

Ordinarily, cyclists will drink water from a bottle, and drink gel from either a disposable packet or a refillable flask. — New Atlas, 31 Aug. 2026

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