The Collaborative International Dictionary of English v.0.48:

Vertiginous \Ver*tig"i*nous\, a. [L. vertiginosus, fr. vertigo a
   whirling around, giddiness: cf. F. vertigineux. See
   Vertigo.]
   1. Turning round; whirling; rotary; revolving; as, a
      vertiginous motion.
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            Some vertiginous whirl of fortune.    --De Quincey.
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   2. Affected with vertigo; giddy; dizzy.
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            They [the angels] grew vertiginous, and fell from
            the battlements of heaven.            --Jer. Taylor.
      [1913 Webster] -- Ver*tig"i*nous*ly, adv. --
      Ver*tig"i*nous*ness, n.
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