'The Night Before Christmans' definitions:

Definition of 'The Night Before Christmans'

From: GCIDE

Saint Nicholas \Saint Nicholas\, St Nicholas \St. Nicholas\, n. A Dutch saint, who was reputed to bring gifts to children on Christmas even, giving rise to the modern legend of {Santa Claus}. [PJC]
A Visit from St. Nicholas The original name for a poem by Clement Clarke Moore, popularly called titled {The Night Before Christmans}. It is a popular poem with the theme of St. Nicholas (Santa Claus) coming to bring gifts to children on Christmans eve. See Night Before Christmas in the vocabulary. [PJC]