antiplastic adjective 3noun 2forms 3 adjective3 •Opposing the use of plastics, typically for environmental reasons. •Diminishing plasticity. •Preventing or checking the process of healing, or granulation. noun2 •A substance added to clay to make it less malleable. •Any substance that prevents the process of healing, or granulation. formsantiplastics · more antiplastic · most antiplastic