a chair whose seat turns around horizontally on a swivel.
a chair, the seat of which is joined to the legs by a swivel and which thus may be spun round
Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Say, for example, you invent a four-legged swivel chair.
Most days he sits in an armless swivel chair, bent over computers set up on a folding table.
It should be furnished with a small desk and a movable swivel chair.