trichrome Syllabification: (tri·chrome)Pronunciation: /ˈtrīˌkrōm/Definition of trichrome adjective Biology denoting a stain or method of histological staining in which different tissues are stained, each in one of three different colors. Origin: early 20th century: from tri- 'three' + Greek khrōma 'color'trichrome in other Oxford dictionaries Definition of trichrome in the British & World English dictionary