[1] : The Collaborative International Dictionary of English v.0.48

simoom \simoom"\, simoon \simoon"\, n. ar. sam?m, fr. samma
   to poison. cf. samiel.
   a hot, dry, suffocating, dust-laden wind, that blows
   occasionally in arabia, syria, and neighboring countries,
   generated by the extreme heat of the parched deserts or sandy
   plains.
   1913 webster
see also:
samiel 

[2] : WordNet (r) 2.0

simoon
     n : a violent hot sand-laden wind on the deserts of arabia and
         north africa syn: simoom, samiel
see also:
simoom samiel 

Simoon >> S Words
Simoon, definition of term: Simoon
simoon_pag1.html