lullaby Copy link Outline 1. lallus or lallum2. quĕrēla (any plaintive strain) • lullaby: 1. lallus or lallum: the sleep-bringing strains of a l., lalli somniferi modi, Aus. Epist. 16, 91. 2. quĕrēla (any plaintive strain): to invite sleep by a long l., longa somnum suadere q., Stat. Th. 5, 616. Phr.: to sing a l., lallo, 1: Pers. 3, 18.