Webster's English Dictionary

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vertiginous

ver.tig.i.nous \(.)v*r-'tij-*-n*s\ aj [L vertiginosus, fr. vertigin-, 
   vertigo] 1: characterized by or suffering from vertigo : DIZZY  2: GIDDY, 
   INCONSTANT  3: causing or tending to cause dizziness  4: marked by turning 
   : ROTARY {the ~ motion of the earth> - ver.tig.i.nous.ly av