Source : Webster's Revised Unabridged Dictionary (1913)

Fils \Fils\, n. [F., fr. L. filius. See {Filial}.]
   Son; -- sometimes used after a French proper name to
   distinguish a son from his father, as, Alexandre Dumas, fils.

Source : WordNet®

fils
     n 1: 100 Yemeni fils are worth one Yemeni rial [syn: {Yemeni fils}]
     2: a fractional monetary unit in Bahrain and Iraq and Jordan
        and Kuwait; equal to one thousandth of a dinar