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meter

1. One who, or that which, metes or measures. See coal-meter.

2. An instrument for measuring, and usually for recording automatically, the quantity measured. Dry meter, a gas meter having measuring chambers, with flexible walls, which expand and contract like bellows and measure the gas by filling and emptying. Wt meter, a gas meter in which the revolution of a chambered drum in water measures the gas passing through it.

Origin: From Mete to measure.