mongoose Syllabification: (mon·goose)Pronunciation: /ˈmänˌgo͞os, ˈmäNG-/Definition of mongoose noun (plural mongooses) a small carnivorous mammal with a long body and tail and a grizzled or banded coat, native to Africa and Asia. Family Herpestidae (or Viverridae): several genera, in particular Herpestes and Mungos, and many species, including the banded mongoose (M. mungo) Origin: late 17th century: from Marathi maṅgūsmongoose in other Oxford dictionaries Definition of mongoose in the British & World English dictionary