berceuse ber·ceuse UK/bɛəˈsɜːz/ US/bɜː-/ uncommon noun 1. a quiet song intended to lull a child to sleep Synonymslullabycradlesong Related words Broader terms song WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved.