Sikh /siːk/adjective 1noun 1forms 3 adjective1 •Of, or relating to the Sikhs or to Sikhism.A year earlier, the Canadian leader was seen at a Sikh event in Toronto where separatist flags and posters depicting an extremist Sikh leader killed in a 1984 Indian Army operation were displayed. — 2024 noun1 •An adherent of Sikhism. formsSikhs · more Sikh · most Sikh