"Raqs Sharqi" (literally:
"oriental dance") is the name used in the Middle
East. The term "Belly Dance" is said to have been coined
in the United States to attract people to an exhibit
called "The Streets of Cairo" at the Chicago World's
Fair in 1893.
General background and explanation from Wikipedia
The Ghawazee perform, unveiled, in the public streets, even to amuse the rabble. Their dancing has little of elegance; its chief peculiarity being a very rapid vibrating motion of the hips, from side to side.
They are never admitted into a respectable hareem, but are not unfrequently hired to entertain a party of men in the house of some rake. In this case, as might be expected, their performances are yet more lascivious than those which I have already mentioned ... I need scarcely add that these women are the most abandoned of the courtesans of Egypt.
- variously spelled Schikhatt, Shakhatt or Chikhat -
means "female sheikhs". This is an erotic women-only
dance, originally performed for the bride before her wedding,
with the idea of teaching her how she would be expected to
move in the marriage bed.