Source : Webster's Revised Unabridged Dictionary (1913)

Carburize \Car"bu*rize\ (k[aum]r"b[-u]*r[imac]z), v. t. [imp. &
   p. p. {Carburized}; p. pr. & vb. n. {Carburizing}.] (Chem.)
   To combine with carbon or a carbon compound; -- said esp. of
   a process for conferring a higher degree of illuminating
   power on combustible gases by mingling them with a vapor of
   volatile hydrocarbons.

Source : WordNet®

carburize
     v : unite with carbon; "carburize metal" [syn: {carbonize}, {carbonise},
          {carburise}]