The Collaborative International Dictionary of English v.0.48:
Twelfth-day \Twelfth"-day`\, n. See Twelfthtide. [1913 Webster]The Collaborative International Dictionary of English v.0.48:
Twelfthtide \Twelfth"tide`\, n. The twelfth day after Christmas; Epiphany; -- called also Twelfth-day. [1913 Webster]