placamentum
From LSJ
plācāmentum: i, n. id.,
I a means of pacifying or appeasing, a lenitive (postAug.): hoc veluti placamento terrae blandiuntur, Plin. 21, 7, 19, § 42.—In <number opt="n">plur.</number>: deŭm placamenta, Tac. A. 15, 44; id. H. 1, 63.