The definition of a femme fatale is a woman who seduces men and often leads them into dangerous or bad situations.
An example of a femme fatale is a woman who pretends to be interested in a man, leads him home and then tortures him.
pl. femmes fa·tales′
an alluring woman, esp. one who leads men to their downfall or ruin
Origin of femme fataleFr, literally , deadly woman
nounpl. femmes fa·tales
An alluring and seductive woman, especially one who leads men into compromising and dangerous situations.
Origin of femme fataleFrench : femme, woman + fatale, deadly.
(plural femmes fatales or femme fatales)