1. The fundamental unit of length in the SI and metric systems, equivalent to 39.37007874 inches. Defined to be the length of the path traveled by light in a vacuum in 1299792458 sec. 2. A device for measuring the quantity of that which passes through it. [Fr. metre; G. metron, measure]
- potential acuity m. (PAM) instrument used to project an image such as Snellen test types through a cataractous lens onto the retina in order to predict likely visual function if the cataract were removed.
- rate m. a device that continuously displays the magnitude of events averaged over varying time intervals.
- Venturi m. a device for measuring flow of a fluid in terms of the drop in pressure when the fluid flows into the constriction of a Venturi tube.
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me·ter or chiefly Brit me·tre 'mēt-ər n the base unit of length in the International System of Units that is equal to the distance traveled in a vacuum by light in 1/299,792,458 second or to about 39.37 inches
meter n an instrument for measuring and sometimes recording the time or amount of something
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me·ter (meґtər) [Gr. metron measure] 1. the base SI unit of linear measure, approximately equivalent to 39.37 inches; currently defined as the distance that light will travel in a vacuum in 1/299,792,458 of a second. Symbol m. 2. an apparatus for measuring the quantity of something passing through it, such as a gas or an electric current.Medical dictionary. 2011.