Rossel current \Ros"sel cur`rent\ [From Rossel Island, in the Louisiade Archipelago.] (Oceanography) A portion of the southern equatorial current flowing westward from the Fiji Islands to New Guinea. [Webster 1913 Suppl.] Rossel current \Ros"sel cur`rent\ [From Rossel Island, in the Louisiade Archipelago.] (Oceanography) A portion of the southern equatorial current flowing westward from the Fiji Islands to New Guinea.