Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
Imbros and Imbrus, i, m., = Ἴμβρος, a small island in the Ægean Sea, over against the Chersonesus Thracica, near Lemnos and Samothrace, now Imbro, Mel. 2, 7, 8; Plin. 4, 12, 23, § 72; Liv. 33, 30 fin. al.
Called Imbria terra, Ov. Tr. 1, 10, 18.