A skilled worker who cuts, fits, and installs glass in windows, doors, and other structures.
From Old English glær (glass) plus the agent suffix -ier, becoming a professional designation in Middle English. The word crystallized as a formal trade name during the medieval period when glass-working became a recognized guild profession.
Glaziers were so important in medieval times that they had their own powerful guilds, and stained glass windows were so valuable that armies would actually target them during sieges to damage a city's wealth and morale.
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