Learn how to say Triumvirs correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word triumvir:
noun (plural triumvirs or triumviri /-rʌɪ/)
(in ancient Rome) each of three public officers jointly responsible for overseeing any of the administrative departments.
Latin, originally as triumviri (plural), back-formation from trium virorum ‘of three men’, genitive of tres viri