ROISTER

PRONUNCIATION: ROY-stuhr)

MEANING: verb intr.:
1. To revel noisily and boisterously.
2. To behave in a swaggering manner.

ETYMOLOGY: From the verb use of the noun roister, via French from Latin rusticus (rustic). Earliest documented use: 1663.
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ROYSTER - pearl-containing shellfish fit for a King

ROIDSTER - body-builder who uses testosterone derivatives

ROASTER - emcee at the White House Correspondents' Dinner