[τροχός] from G5143; a wheel (as a runner), i.e. (figuratively) a circuit of physical effects
Usages throughout the bible
James 3:6
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And the tongue is a fire, a world of iniquity: so is the tongue among our members, that it defileth the whole body, and setteth on fire the course G5164 of nature; and it is set on fire of hell.