Low Sunday, in the Roman Catholic Church, is the first Sunday after Easter. It is so called in contrast to the great festival whose octave it ends. In France and Germany it is usually called Quasimodo, from the first word of the introit (1 Peter, ii. 2) in the Mass.
Low Sunday,
Chambers's Encyclopaedia, Volume 6: Humber to Malta, p. 733
Source scan(s): p. 0748