bi ‧ o ‧ de ‧ gra ‧ da ‧ ble /ˌbaɪəʊdɪˈɡreɪdəb ə l◂ $ ˌbaɪoʊ-/ BrE AmE adjective
materials, chemicals etc that are biodegradable are changed naturally by ↑ bacteria into substances that do not harm the environment OPP non biodegradable , non-biodegradable :
This carton is made of biodegradable plastic.