A room, collection, or display area featuring gasoliers; or the business/craft of making gas lighting fixtures.
Formed from 'gasolier' + '-y' suffix (denoting place or collection), following the pattern of words like 'crockery' (place for crocks) or 'drapery' (place for drapes).
Gasoliery is such a specialized Victorian-era term that it's virtually disappeared—it represents an entire industry and aesthetic that vanished within 50 years of the invention of electric lighting, making it a linguistic ghost of technological disruption.
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