Bombay duck Syllabification: (Bom·bay duck)Definition of Bombay duck noun the bummalo (fish), especially when dried and eaten as an accompaniment with curry. Origin: mid 19th century: alteration of bummalo by association with Bombay in India (now Mumbai), from which bummalo were exportedBombay duck in other Oxford dictionaries Definition of Bombay duck in the British & World English dictionary