Definition of Christ candle in English:

Christ candle

noun

US
  • (Originally) a candle lit and placed in a window at Christmas, in the belief that it will guide the Christ child; (in later use) any of various candles lit to celebrate or symbolize Christ, typically during Easter or Christmas.

    In later use often specifically with reference to either the fifth, central candle on an Advent ring or wreath or the paschal candle.

Origin

Late 19th century; earliest use found in Kindergarten (Chicago).