{ } v. t. [ imp. & p. p. Tranquilized r Tranquilliized; p. pr. & vb. n. Tranquilizing r Tranquillizing. ] [ Cf. F. tranquilliser. ] 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. [ 1913 Webster ]