Lewis & Short

pulvĕrātĭcum, i, n., and pulvĕrā-tĭca, ae, f. [pulvis; orig. payment for hard agricultural labor; hence, transf.], drink-money, given for hard labor, Cod. Th. 7, 13, 16; Cassiod. Var. 12, 15; Impp. Theodos. et Valent. ap. Auct. de Re Agr. p. 343 Goes.