biodegradable Syllabification: (bi·o·de·grad·a·ble)Pronunciation: /ˌbīōdiˈgrādəbəl/Translate biodegradable | into French | into German | into Italian | into Spanish Definition of biodegradable adjective (of a substance or object) capable of being decomposed by bacteria or other living organisms. Derivatives biodegradabilityPronunciation: /-ˌgrādəˈbilitē/ noun biodegradable in other Oxford dictionaries Definition of biodegradable in the British & World English dictionary