lignocellulose Syllabification: (lig·no·cel·lu·lose)Pronunciation: /ˌlignōˈselyəˌlōs, -ˌlōz/Definition of lignocellulose noun Botany a complex of lignin and cellulose present in the cell walls of woody plants. lignocellulose in other Oxford dictionaries Definition of lignocellulose in the British & World English dictionary