: 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
Glassware seemingly straight from the mad scientist's lab—beakers, flasks, test tubes, and more—hold candy that guests can enjoy at their own risk, of course.
—
Sarah Martens, Better Homes & Gardens, 28 Oct. 2024
In Your Pack: Not every run requires a backpack or hydration vest of some sort, but super lightweight, comfortable running vests can feel barely there while carrying a phone—plus things like a hydration flask, lightweight jacket, or car or house keys.
—Lisa Jhung, Outside Online, 28 Oct. 2024
The youngest fighters laid out a mat and brought out a flask of camel milk for the general and another older man known as the security chief, who wore a turban and sunglasses to hide a missing eye.
—Clarissa Ward, CNN, 23 Oct. 2024
Designed with smaller frames in mind, the triangular water flasks sit below (rather than awkwardly on top of) your chest, with straws for easy drinking access.
—Jennifer Heimlich, SELF, 17 Oct. 2024
See all Example Sentences for flask 
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Sarah Martens, Better Homes & Gardens, 28 Oct. 2024
In Your Pack: Not every run requires a backpack or hydration vest of some sort, but super lightweight, comfortable running vests can feel barely there while carrying a phone—plus things like a hydration flask, lightweight jacket, or car or house keys.
—Lisa Jhung, Outside Online, 28 Oct. 2024
The youngest fighters laid out a mat and brought out a flask of camel milk for the general and another older man known as the security chief, who wore a turban and sunglasses to hide a missing eye.
—Clarissa Ward, CNN, 23 Oct. 2024
Designed with smaller frames in mind, the triangular water flasks sit below (rather than awkwardly on top of) your chest, with straws for easy drinking access.
—Jennifer Heimlich, SELF, 17 Oct. 2024
See all Example Sentences for flask
Dictionary Entries Near flask
Cite this Entry
“Flask.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/flask. Accessed 15 Nov. 2024.
Copy CitationKids Definition
flask
noun
: a container shaped like a flattened bottle
Medical Definition
flask
1 of 2 noun
: 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
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