Mongoose \Mon"goose\, Mongoos \Mon"goos\, n.; pl. {Mongooses} 1. (Zool.) A species of ichneumon ({Herpestes griseus}), native of India. Applied also to other allied species, as the African banded mongoose ({Crossarchus fasciatus}). [Written also {mungoose}, {mungoos}, {mungous}.] [1913 Webster] 2. [Tamil manegos.] A Madagascan lemur ({Lemur mongos}). [Webster 1913 Suppl.]