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Any instrument for measuring the degree of rotation or torsion, as of the eyeball or the shaft of a long bone.
[G. tropē, a turning, + metron, measure]
tropometer(trŏp-ŏm′ĕ-ter) [″ + metron, measure]
1. A device for measuring the rotation of the eyeballs.
2. An instrument for measuring torsion in long bones.