collodion Syllabification: (col·lo·di·on)Pronunciation: /kəˈlōdēən/Definition of collodion noun a syrupy solution of nitrocellulose in a mixture of alcohol and ether, used for coating things, chiefly in surgery and in a former photographic process. Origin: mid 19th century: from Greek kollōdēs 'gluelike', from kolla 'glue'collodion in other Oxford dictionaries Definition of collodion in the British & World English dictionary