plasticize Syllabification: (plas·ti·cize)Pronunciation: /ˈplastəˌsīz/Definition of plasticize verb [with object] (often as adjective plasticized) make plastic or moldable, especially by the addition of a plasticizer. treat or make with plastic:plasticized cottonDerivatives plasticizationPronunciation: /ˌplastəsiˈzāSHən/ noun plasticize in other Oxford dictionaries Definition of plasticize in the British & World English dictionary