From Longman Dictionary of Contemporary Englishtricolourtri‧col‧our British English, tricolor American English /ˈtrɪkələ $ ˈtraɪˌkʌlər/ noun [countable] Pa flag with three equal bands of different colours, especially the national flags of France or Ireland
Examples from the Corpus
tricolour• The Who accordingly took the Dublin stage in specially made green, white and gold tricolour gear.• A lank forelock fell from beneath the hat bearing the tricolour cockade.• And I also know that certain shops in Northern Ireland refused to display it because of the tricolour so that accusation is quite legitimate. 