microsite Syllabification: (mi·cro·site)Pronunciation: /ˈmīkrəˌsīt/Translate microsite | into Italian Definition of microsite noun 1an auxiliary website with independent links and address that is accessed mainly from a larger site. 2a small part of an ecosystem that differs markedly from its immediate surroundings. microsite in other Oxford dictionaries Definition of microsite in the British & World English dictionary