Meaning of “plastic” - Learner’s Dictionary

plastic

noun [ C, U ] uk us /ˈplæstɪk/

A2 a light, artificial substance that can be made into different shapes when it is soft and is used in a lot of different ways:

Most children's toys are made of plastic.
plastic adjective

A2

a plastic bag

(Definition of “plastic” from the Cambridge Learner’s Dictionary © Cambridge University Press)