Hamamatsu Syllabification: (Ha·ma·ma·tsu)Pronunciation: /ˌhäməˈmätso͞o/Definition of Hamamatsu an industrial city in Japan, on the southern coast of the island of Honshu; population 788,078 (2007). Hamamatsu in other Oxford dictionaries Definition of Hamamatsu in the British & World English dictionary