circumferentor

noun

cir·​cum·​fer·​en·​tor

sə(r)ˈkəm(p)fəˌrentə(r)

plural -s

1

: a surveyor's compass with diametral projecting arms each carrying a vertical slit sight

2

: a graduated wheel formerly used to measure tires

Word History

Etymology

Latin circumferentia circumference + English -or

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