plasticizePronunciation: /ˈplastɪsʌɪz/ (also plasticise)Definition of plasticize verb [with object] (often as adjective plasticized) make plastic or mouldable, especially by the addition of a plasticizer. treat or make with plastic:plasticized cottonDerivatives plasticization noun plasticize in other Oxford dictionaries Definition of plasticize in the US English dictionary