[rois.ter] n [MF rustre lout, alter. of ruste, fr. ruste, adj., rude, rough, fr. L rusticus rural--more at rustic] (1551) archaic: one that roisters: roisterer
[2]roister vi rois.tered ; rois.ter.ing (1582): to engage in noisy revelry: carouse -- rois.ter.er n -- rois.ter.ous adj -- rois.ter.ous.ly adv