From Japanese-English FreeDict Dictionary ver. 0.1:
[ichi1] [news1] [nf02] 何 /(en)tʃˈaɪniːz(ja)lˈe̞tə/, [ichi1] [news1] [nf02] なに /nˈäni/, [ichi1] なん /nˈäɴ/
1. (pronoun)
(nouns which may take the genitive case particle `no')
what
2. (なん)
(prefix)
何か月 (followed by a counter)
how many
3. (noun (common) (futsuumeishi))
you-know-what, that
4. (expressions (phrases, clauses, etc.))
whatsit, what's the expression, what do you call them
5. (interjection (kandoushi))
(expressing surprise)
what?
6. (expressing anger or irritability)
hey!