Definition of revelous in US English:

revelous

adjective

  • Given to revelling; of or characterized by revelry.

Origin

Late Middle English; earliest use found in Geoffrey Chaucer (c1340–1400), poet and administrator. From Anglo-Norman revelus, Middle French reveleus (French (now regional: Northern) reveleux) impetuous, rebellious, petulant, boisterous, merry, joyful from revel + -eus, -ous, -us. Compare Old Occitan revelhos.