gyratory

[jahy-ruh-tawr-ee, -tohr-ee]
adjective
moving in a circle or spiral; gyrating.

Origin:
1810–20; gyrat(ion) + -ory1

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World English Dictionary
gyrate
 
vb
1.  (intr) to rotate or spiral, esp about a fixed point or axis
 
adj
2.  biology curved or coiled into a circle; circinate
 
[C19: from Late Latin gӯrāre, from Latin gӯrus circle, from Greek guros]
 
gyratory
 
adj

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Example sentences
Loose mix was compacted in the laboratory using the gyratory compactor.
The gyratory testing machine was used to simulate the compaction of asphalt concrete mixes and subsequent exposure to traffic.
It also has a calibrated and gyratory weight in the interior.
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