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perturb
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English Dictionary: perturb by the DICT Development Group
2 results for perturb
From WordNet (r) 3.0 (2006) [wn]:
perturb
v
  1. disturb in mind or make uneasy or cause to be worried or alarmed; "She was rather perturbed by the news that her father was seriously ill"
    Synonym(s): perturb, unhinge, disquiet, trouble, cark, distract, disorder
  2. disturb or interfere with the usual path of an electron or atom; "The electrons were perturbed by the passing ion"
  3. cause a celestial body to deviate from a theoretically regular orbital motion, especially as a result of interposed or extraordinary gravitational pull; "The orbits of these stars were perturbed by the passings of a comet"
  4. throw into great confusion or disorder; "Fundamental Islamicists threaten to perturb the social order in Algeria and Egypt"
    Synonym(s): perturb, derange, throw out of kilter
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
   Perturb \Per*turb"\, v. t. [L. perturbare, perturbatum; per +
      turbare to disturb, fr. turba a disorder: cf. OF. perturber.
      See {Per-}, and {Turbid}.]
      1. To disturb; to agitate; to vex; to trouble; to disquiet.
  
                     Ye that . . . perturb so my feast with crying.
                                                                              --Chaucer.
  
      2. To disorder; to confuse. [R.] --Sir T. Browne.
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