The word “Xmas”

 According to popular belief, the word "Xmas" was introduced as a secularized version of the word Christmas. This is wrong. The "X" part of the word comes from the Greek letter "chi" (Χχ), which in turn is the first letter of the Greek word “Χριστός” which translates into Christ. The “mas” part of the word derives from the Late Latin word: “missa”.