Source : Webster's Revised Unabridged Dictionary (1913)

Christmastide \Christ"mas*tide`\, n. [Christmas + tide time.]
   The season of Christmas.

Source : WordNet®

Christmastide
     n : period extending from Dec. 24 to Jan. 6 [syn: {Christmas}, {Christmastime},
          {Yule}, {Yuletide}, {Noel}]