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1. (n.) radiometer
an instrument for demonstrating the transformation of radiant energy into mechanical work.
2. radiometer
an instrument for detecting small amounts of radiant energy.
Etymology: (1870–75)
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| Definition of 'radiometer' |
Princeton's WordNet |
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1. (noun) radiometer
meter to detect and measure radiant energy (electromagnetic or acoustic)
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| Definition of 'radiometer' |
Webster Dictionary |
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1. (noun) radiometer
a forestaff
2. (noun) radiometer
an instrument designed for measuring the mechanical effect of radiant energy
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| Definition of 'radiometer' |
The Standard Electrical Dictionary |
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1. radiometer
An instrument consisting of four vanes poised on an axis so as to be free to rotate, and contained in a sealed glass vessel almost perfectly exhausted. The vanes of mica are blackened on one side.
On exposure to light or a source of heat (ether waves) the vanes rotate. The rotation is due to the beating back and forth of air molecules from the surface of the vanes to the inner surface of the glass globe.
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Definitions of radiometer 
