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Adjective: alleviatory  u'lee-vee-u,to-ree [N. Amer], u'lee-vee-u-t(u-)ree [Brit]
  1. Moderating pain or sorrow by making it easier to bear
    "The alleviatory effects of the medication provided much-needed relief";
    - alleviative, lenitive, mitigative, mitigatory, palliative

See also: moderating