Plastic  —n. 1 synthetic resinous substance that can be given any shape. 2 (in full plastic money) colloq. Credit card(s). —adj. 1 made of plastic. 2 capable of being moulded; pliant, supple. 3 giving form to clay, wax, etc.  plasticity n. Plasticize v. (also -ise) (-zing or -sing). Plasticizer n. (also -iser). Plasticky adj. [greek: related to *plasma]