Mum·bai (mŭm′bī′) Formerly Bom·bay (bŏm-bā′) A city of west-central India, on a coastal island on the Arabian Sea. The capital of the state of Maharashtra, Mumbai is India’s largest city and a major port and commercial center. Mumbai (mʊmˈbaɪ) n (Placename) a port in W India, capital of Mahrashtra state, on the Arabian Sea: ceded by …

