Source : WordNet®

ataractic
     n : a drug used to reduce stress or tension without reducing
         mental clarity [syn: {tranquilizer}, {tranquillizer}, {tranquilliser},
          {antianxiety agent}, {ataractic drug}, {ataractic agent}]

ataractic
     adj : tending to soothe or tranquilize; "valium has a
           tranquilizing effect"; "took a hot drink with sedative
           properties before going to bed" [syn: {ataraxic}, {sedative},
            {tranquilizing}, {tranquilising}]