Webster's English Dictionary

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perturb

Cross references:
  1. discompose            
 
per.turb \p*r-'t*rb\ \-'t*r-b*-b*l\ vt [ME perturben, fr. MF perturber, fr. 
   L perturbare to throw in]to confusion, fr. per- + turbare to disturb - more 
   at TURBID 1: to disturb greatly in mind : DISQUIET  2: to throw into 
   confusion : DERANGE  3: to cause (a celestial body) to deviate from a 
   theoretically regular orb ital motion - per.turb.able aj