Red-letter
Pronunciation : Red"-let`ter (-lt`tr)
Part of Speech : a.
Definition : Defn: Of or pertaining to a red letter; marked by red letters. Red- letter day, a day that is fortunate or auspicious; -- so called in allusion to the custom of marking holy days, or saints' days, in the old calendars with red letters.
Source : Webster's Unabridged Dictionary, 1913