Tranquilizing \Tran"quil*i`zing\, Tranquillizing \Tran"quil*li`zing\, a. Making tranquil; calming. " The tranquilizing power of time." --Wordsworth. -- {Tran"quil*i`zing*ly} or {Tran"quil*li`zing*ly}, adv. [1913 Webster]