Childermas day \Chil"dermas day`\ [AS. cildam[ae]sse-d[ae]g;
cild child +d[ae]g day.] (Eccl.)
A day (December 28) observed by mass or festival in
commemoration of the children slain by Herod at Bethlehem; --
called also {Holy Innocent's Day}.
[1913 Webster]