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Adjective: alleviative  u'lee-vee,ey-tiv [N. Amer], u'lee-vee-u-tiv [Brit]
  1. Moderating pain or sorrow by making it easier to bear
    "The alleviative effects of the medication provided much-needed relief";
    - alleviatory, lenitive, mitigative, mitigatory, palliative

See also: moderating