1. An instrument for measuring angles.
2. An appliance for the static test of labyrinthine disease, which consists of a plank, one end of which may be raised to any desired height; as one end of the plank is gradually raised, the point at which a patient loses balance is noted.
3. A calibrated device designed to measure the arc or range of motion of a joint.
Synonym: arthrometer, fleximeter, pronometer.
Origin: G. Gonia, angle, – metron, measure