cancellous Syllabification: (can·cel·lous)Pronunciation: /ˈkansələs/Definition of cancellous adjective Anatomy of or denoting bone tissue with a meshlike structure containing many pores, typical of the interior of mature bones. Origin: mid 19th century: from Latin cancelli 'crossbars' + -ouscancellous in other Oxford dictionaries Definition of cancellous in the British & World English dictionary