hairdo Syllabification: (hair·do)Pronunciation: /ˈhe(ə)rˌdo͞o/Translate hairdo | into French | into German | into Italian | into Spanish Definition of hairdo noun (plural hairdos) informal the style of a person’s hair. an act of styling a person’s hair (used especially of a woman’s hair). hairdo in other Oxford dictionaries Definition of hairdo in the British & World English dictionary