Since you guys are talking about the race instead of the gender, consider this: why was the witch king so confident going against Gandalf? Gandalf is not of the race of men. Gandalf seems to imply that if the prophecy is true (a key condition since the prophecy was made by someone weaker than gandalf... glorfindel) that gandalf can't kill him. Therefore, I would assume that it did not imply the race of men, but the gender. Also, I think the prophecy did not mean that a male could not kill him... just that by luck or fate it would not work out that way.
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