A person who makes, sells, or works with flasks, or a device used in the manufacturing process of flasks.
Derived from 'flask' (a narrow-necked bottle or container) + '-er' (agent suffix meaning 'one who does or makes'), referring to either a craftsperson or a manufacturing tool.
Medieval and Renaissance glassmakers had specialized 'flaskers' and other craftspeople—the guild system was so detailed that different workers handled different stages of flask production.
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