tranquilize
Tran"quil*ize, Tran"quil*lize, v. t. [imp. & p. p. Tranquilized or Tranquilliized; p. pr. & vb. n. Tranquilizing or Tranquillizing.] Etym: [Cf. F. tranquilliser.] Defn: To render tranquil; to allay when agitated; to compose; to make calm and peaceful; as, to tranquilize a state disturbed by factions or civil commotions; to tranquilize the mind. Syn. -- To quiet; compose; still; soothe; appease; calm; pacify.