Relating to, involving, or producing circular or spiral motion; rotating.
From Latin 'gyratorius', derived from 'gyrare' (to turn). The English adjective entered usage in the 19th century to describe rotating or spiraling things.
A gyratory motion is what makes a roundabout (or traffic circle) work smoothly—the continuous circular flow prevents head-on collisions and lets traffic flow in one direction.
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