What does vertigo mean?

ver•ti•go

Pronunciation: (vûr'ti-gO"), [key]
—n.,
—pl. ver•ti•goes, ver•tig•i•nesPronunciation: (vur-tij'u-nEz"). [key] Pathol.
a dizzying sensation of tilting within stable surroundings or of being in tilting or spinning surroundings.