“The "X" comes from the Greek letter Chi, which is the first letter of the Greek word Χριστός, which in English is "Christ". The "-mas" part is from the Latin-derived Old English word for Mass”.
“The "X" comes from the Greek letter Chi, which is the first letter of the Greek word Χριστός, which in English is "Christ". The "-mas" part is from the Latin-derived Old English word for Mass”.