trembler

from WordNet (r) 3.0 (2006)

trembler
    n 1: one who quakes and trembles with (or as with) fear [syn:
         {quaker}, {trembler}]

from The Collaborative International Dictionary of English v.0.48

Trembler \Trem"bler\, n.
   One who trembles.
   [1913 Webster]

   2. Any of certain West Indian birds of the genera
      {Cinclocerthia} and {Rhamphocinclus}, of the family
      {Mimidae}.
      [Webster 1913 Suppl.]

   3. (Elec.) The vibrating hammer, or spring contact piece of a
      hammer break, as of the electric ignition apparatus for an
      internal-combustion engine.
      [Webster 1913 Suppl.]