From The Collaborative International Dictionary of English v.0.48:

Watt \Watt\, n. [From the distinguished mechanician and
   scientist, James Watt.] (Physics)
   A unit of power or activity equal to 10^7 C.G.S. units of
   power, or to work done at the rate of one joule a second. An
   English horse power is approximately equal to 746 watts.
   [1913 Webster]
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