Solomon Islands UK /ˈsɒl.ə.mən ˈaɪ.ləndz/US /ˈsɑ.lə.mən ˈaɪ.ləndz/ noun1 •A country consisting of the majority of the Solomon Islands archipelago in Melanesia, in Oceania, as well as the Santa Cruz Islands. Official name: Solomon Islands. Capital and largest city: Honiara.