carburize Syllabification: (car·bu·rize)Pronunciation: /ˈkärb(y)əˌrīz/Definition of carburize verb [with object] add carbon to (iron or steel), in particular by heating in the presence of carbon to harden the surface. Derivatives carburizationPronunciation: /ˌkärb(y)ərəˈzāSHən/ noun Origin: mid 19th century: from French carbure 'carbide' + -izecarburize in other Oxford dictionaries Definition of carburize in the British & World English dictionary