Ember day

noun
  1. any of the days in the quarterly three-day period of prayer and fasting (the Wednesday, Friday, and Saturday after the first Sunday in Lent, after Whitsunday, after Sept. 14, and after Dec. 13) observed in the Roman Catholic Church and other Western churches.

Origin of Ember day

before 1050; Middle English ymber day, Old English ymbrendæg, plural -dagas, equivalent to ymbryne recurrence (ymb(e) around + ryne a running) + dæg day
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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Historical Examples of ember day