WallaceaPronunciation: /wɒˈleɪsɪə/ ZoologyDefinition of Wallacea a zoogeographical area constituting a transition zone between the Oriental and Australian regions, east of Wallace’s line. It is generally held to comprise Sulawesi and other islands between the two continental shelves. Derivatives Wallacean adjective Origin: 1920s: from the name of A. R. Wallace (see Wallace, Alfred Russel)
