[syn: ataractic, ataraxic, sedative, tranquilizing, tranquillizing, tranquilising, tranquillising]
The Collaborative International Dictionary of English v.0.48:
ataractic \ataractic\ ataraxic \ataraxic\adj.
   1. tending to soothe or calm or tranquilize
   Syn: calming, sedative, soothing, tranquilizing
        [WordNet 1.5]
The Collaborative International Dictionary of English v.0.48:
ataractic \ataractic\ n.
   1. 1 drug that reduces nervous tension and gives peace of
      mind.
   Syn: ataraxic
        [WordNet 1.5] Ataraxia
WordNet (r) 3.0 (2006):
ataractic
    adj 1: tending to soothe or tranquilize; "valium has a
           tranquilizing effect"; "took a hot drink with sedative
           properties before going to bed" [syn: ataractic,
           ataraxic, sedative, tranquilizing,
           tranquillizing, tranquilising, tranquillising]
    n 1: a drug used to reduce stress or tension without reducing
         mental clarity [syn: tranquilizer, tranquillizer,
         tranquilliser, antianxiety agent, ataractic drug,
         ataractic agent, ataractic]