Narrow-necked bottles, often used in science labs or to carry drinks, or multiple containers of this type.
From Middle English 'flask,' possibly from Italian 'fiasco' (bottle) or Dutch 'fles.' The word entered English around the 1400s for containers.
The word 'fiasco' (meaning disaster) comes from the same root as 'flask'—because when a glass flask was imperfect, glassmakers used it as a regular bottle and called it a 'fiasco'!
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