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]

WordNet (r) 3.0 (2006):

watt
    n 1: a unit of power equal to 1 joule per second; the power
         dissipated by a current of 1 ampere flowing across a
         resistance of 1 ohm [syn: watt, W]
    2: Scottish engineer and inventor whose improvements in the
       steam engine led to its wide use in industry (1736-1819)
       [syn: Watt, James Watt]