[f. prec. + -ER1.] One who or that which tranquilizes.
1811. Leeds Mercury, 30 Nov., 3/1. The Riots of Nottinghamshire have been partly put down by the presence of the powerful tranquilizer—a Military Force.
1822–56. De Quincey, Confess. (1862), 241. A tranquilliser of nervous and anomalous sensations.
1891. T. Hardy, Tess, l. Nightfall … came as a tranquillizer on this March day.
