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The Collaborative International Dictionary of English v.0.48:

Circumferentor \Cir*cum`fer*en"tor\, n. [See Circumfer.] [1913 Webster] 1. A surveying instrument, for taking horizontal angles and bearings; a surveyor's compass. It consists of a compass whose needle plays over a circle graduated to 360[deg], and of a horizontal brass bar at the ends of which are standards with narrow slits for sighting, supported on a tripod by a ball and socket joint. [1913 Webster] 2. A graduated wheel for measuring tires; a tire circle. [1913 Webster]