1. To make or to become any of a large group of synthetic compounds made from basic raw materials, such as coal, water, and limestone and molded by heat, pressure, etc. into a variety of forms: Many bottles have been plasticized so they can contain water, milk, and other liquids for people to buy and to use.
2. To make mouldable: While sculpturing, the artist can plasticize the material to form many artistic figures.