Gandalf and the witch king

Why is it odd that he is being to referred to as the Witch King. It is his name. Here is a few possible uses for the word Witch (taken directly from dictionary.com)

1. A woman claiming or popularly believed to possess magical powers and practice sorcery.

2. A believer or follower of Wicca; a Wiccan.

3. A hag.

4. A woman considered to be spiteful or overbearing.

5. Informal. A woman or girl considered bewitching.

6. One particularly skilled or competent at one's craft: “A witch of a writer, [she] is capable of developing an intensity that verges on ferocity” (Peter S. Prescott).

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Also:

Witch\, n. [OE. wicche, AS. wicce, fem., wicca, masc.; perhaps the same word as AS. w[=i]tiga, w[=i]tga, a soothsayer (cf. Wiseacre); cf. Fries. wikke, a witch, LG. wikken to predict, Icel. vitki a wizard, vitka to bewitch.] 1. One who practices the black art, or magic; one regarded as possessing supernatural or magical power by compact with an evil spirit, esp. with the Devil; a sorcerer or sorceress; -- now applied chiefly or only to women, but formerly used of men as well.

Also taken from Dictionary.com

The witch king faces Gandalf and they exchange a few words. The witch king is all cocky and everything while Gandalf stands firm and they are about to beat the crap out of each other. That is, until the Rohirrim arrive, and the witch king has to leave to take care of them.

Yes, that 'Witch' is a female only term is a modern day misconception.