Webster's English Dictionary

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tempestuous

tem.pes.tu.ous \tem-'pes(h)-ch*-w*s\ aj [LL tempestuosus, fr. OL tempestus 
   season, weather, storm, fr. t]empus : of, involving, or resembling a 
   tempest : TURBULENT, STORMYM - tem.pes.tu.ous.ly av