fils /ˈfiːs/adjective 1noun 1/fɪls/ noun 1forms 1 adjective1 •Used after a proper name that is common to a father and his son to indicate that the son is being referred to rather than the father. noun1 •(rare) The son referred to in the manner of the adjective above. fils /fɪls/ noun1 •Subdivision of currency used in many Arab countries. formsfulus