A large metal storage tank used to hold and regulate the pressure of gas in a gas distribution system.
From 'gas' (a state of matter or fuel) plus 'holder' (something that holds or contains); the term emerged during the Industrial Revolution when gas distribution systems became common in the 1800s.
Gasholders were the iconic cylindrical towers of industrial cities, rising and falling visibly as they stored town gas—now the structures are mostly obsolete but they're being converted into luxury apartment buildings around the world.
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