#tremor  shaking or trembling (usually resulting from weakness or stress or disease)
  supertype:  shakiness__shakines__trembling__quiver__quivering__vibration__palpitation  a shaky motion; "the shaking of his fingers as he lit his pipe"
  part of:  paralysis_agitans
  subtype:  essential_tremor__essentialtremor  tremor of unknown cause (usually of the hands and head) that develops in older people; often mistaken for Parkinsonism but is not life-threatening and can usually be kept under control

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