From The Collaborative International Dictionary of English v.0.48:

Kelvin \Kel"vin\ (k[e^]l"v[i^]n), n. [from Lord Kelvin, English
   The SI unit of temperature, defined as being 1/273.16 of the
   triple point of water; abbreviated K. The melting point of
   water at 760 mm pressure is 273.15 Kelvins, and the boiling
   point 373.15 Kelvins. One degree Kelvin is equal to one
   degree Centigrade, and 9/5 degrees Fahrenheit.
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