intr.v. rois·tered, rois·ter·ing, rois·ters
1. To engage in boisterous merrymaking; revel noisily.
2. To behave in a blustering manner; swagger.
[From obsolete roister, roisterer, probably from Old French rustre, ruffian, alteration of ruste, from Latin rūsticus, rustic; see RUSTIC.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2019 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.