Em·ber Day (ěmbər)
n.
A day reserved for prayer and fasting by some Christian churches, observed on the Wednesday, Friday, and Saturday after the first Sunday of Lent, after Whitsunday, after September 14, and after December 13.

[TahlilGaran] American Dictionary ▲

ember day
[Middle English ymer daye, from Old English ymbrendæg : ymbryne, recurrence, course of time (ymbe, around; see ambhi in Indo-European Roots + ryne, a running; see rei- in Indo-European Roots) + dæg, day; see day.]

[TahlilGaran] American Dictionary ▲