Flinders bar Syllabification: (Flin·ders bar)Definition of Flinders bar noun a bar of soft iron placed vertically in or near the housing of a ship’s compass to correct deviation caused by the local magnetic field of the ship. Origin: late 19th century: name after Captain M. Flinders (see Flinders, Matthew)Flinders bar in other Oxford dictionaries Definition of Flinders bar in the British & World English dictionary