Childermas noun. ['tʃɪldǝmas] arch.
[Old English ćildramæsse, from ćildra genit. pl. of ćild CHILD noun + mæsse MASS noun¹.]
1. The festival of the Holy Innocents, 28 December, commemorating Herod's slaughter of the children (Matthew 2:16). OE.

2. The day of the week throughout the year corresponding to the day on which the festival last occurred. Now dial. E17.

[TahlilGaran] English Dictionary ▲