(n.) One who, or that which, mitigates.
Thesaurus Entries
alleviative, alleviator, anodyne, assuager, balm, calmative, cushion, dolorifuge, lenitive, moderator, modulator, mollifier, pacificator, pacifier, palliative, peacemaker, restraining hand, salve, sedative, shock absorber, soother, soothing syrup, stabilizer, temperer, tranquilizer, wiser head
